Fix warning in Field components

Following #8132

Author: fzaninotto

packages/ra-ui-materialui/src/field/BooleanField.tsx

@@ -62,7 +62,7 @@ export const BooleanField: FunctionComponent<BooleanFieldProps> = memo(
                 className={className}
                 {...sanitizeFieldRestProps(rest)}
             >
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         );
     }

packages/ra-ui-materialui/src/field/ChipField.tsx

@@ -24,7 +24,7 @@ export const ChipField: FC<ChipFieldProps> = memo(props => {
                 className={className}
                 {...sanitizeFieldRestProps(rest)}
             >
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         );
     }

packages/ra-ui-materialui/src/field/DateField.tsx

@@ -65,7 +65,7 @@ export const DateField: FC<DateFieldProps> = memo(props => {
                 className={className}
                 {...sanitizeFieldRestProps(rest)}
             >
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         ) : null;
     }

packages/ra-ui-materialui/src/field/EmailField.tsx

@@ -22,7 +22,7 @@ export const EmailField: FC<EmailFieldProps> = memo(props => {
                 className={className}
                 {...sanitizeFieldRestProps(rest)}
             >
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         ) : null;
     }

packages/ra-ui-materialui/src/field/FileField.tsx

@@ -48,7 +48,7 @@ export const FileField = (props: FileFieldProps) => {
                 className={className}
                 {...sanitizeFieldRestProps(rest)}
             >
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         ) : (
             <Root className={className} {...sanitizeFieldRestProps(rest)} />

packages/ra-ui-materialui/src/field/ImageField.tsx

@@ -23,7 +23,7 @@ export const ImageField = (props: ImageFieldProps) => {
                 className={className}
                 {...sanitizeFieldRestProps(rest)}
             >
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         ) : (
             <div className={className} {...sanitizeFieldRestProps(rest)} />

packages/ra-ui-materialui/src/field/NumberField.tsx

@@ -62,7 +62,7 @@ export const NumberField: FC<NumberFieldProps> = memo(props => {
                 className={className}
                 {...sanitizeFieldRestProps(rest)}
             >
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         ) : null;
     }

packages/ra-ui-materialui/src/field/ReferenceField.tsx

@@ -63,7 +63,7 @@ export const ReferenceField: FC<ReferenceFieldProps> = props => {
     return id == null ? (
         emptyText ? (
             <Typography component="span" variant="body2">
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         ) : null
     ) : (
@@ -184,7 +184,9 @@ export const ReferenceFieldView: FC<ReferenceFieldViewProps> = props => {
         return <LinearProgress />;
     }
     if (!referenceRecord) {
-        return emptyText ? <>{translate(emptyText, { _: emptyText })}</> : null;
+        return emptyText ? (
+            <>{emptyText && translate(emptyText, { _: emptyText })}</>
+        ) : null;
     }
 
     let child = children || (

packages/ra-ui-materialui/src/field/ReferenceOneField.tsx

@@ -64,7 +64,7 @@ export const ReferenceOneField = (props: ReferenceOneFieldProps) => {
     return !record || (!isLoading && referenceRecord == null) ? (
         emptyText ? (
             <Typography component="span" variant="body2">
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         ) : null
     ) : (

packages/ra-ui-materialui/src/field/SelectField.tsx

@@ -102,7 +102,7 @@ export const SelectField: FC<SelectFieldProps> = memo(props => {
                 className={className}
                 {...sanitizeFieldRestProps(rest)}
             >
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         ) : null;
     }

packages/ra-ui-materialui/src/field/UrlField.tsx

@@ -20,7 +20,7 @@ export const UrlField: FC<UrlFieldProps> = memo(props => {
                 className={className}
                 {...sanitizeFieldRestProps(rest)}
             >
-                {translate(emptyText, { _: emptyText })}
+                {emptyText && translate(emptyText, { _: emptyText })}
             </Typography>
         );
     }