Fixup get empty cell value is None

gspread/cell.py

@@ -16,12 +16,12 @@ class Cell:
     in a :class:`~gspread.worksheet.Worksheet`.
     """
 
-    def __init__(self, row: int, col: int, value: str = "") -> None:
+    def __init__(self, row: int, col: int, value: Optional[str] = "") -> None:
         self._row: int = row
         self._col: int = col
 
         #: Value of the cell.
-        self.value: str = value
+        self.value: Optional[str] = value
 
     @classmethod
     def from_address(cls, label: str, value: str = "") -> "Cell":

gspread/utils.py

@@ -622,7 +622,7 @@ def cell_list_to_rect(cell_list: List["Cell"]) -> List[List[Optional[str]]]:
     if not cell_list:
         return []
 
-    rows: Dict[int, Dict[int, str]] = defaultdict(dict)
+    rows: Dict[int, Dict[int, Optional[str]]] = defaultdict(dict)
 
     row_offset = min(c.row for c in cell_list)
     col_offset = min(c.col for c in cell_list)

gspread/worksheet.py

@@ -316,10 +316,14 @@ def cell(
                 value_render_option=value_render_option,
                 return_type=GridRangeType.ValueRange,
             )
-            try:
-                value = str(data[0][0])
-            except IndexError:
-                value = str(None)
+
+            # we force a return type to GridRangeType.ValueRange
+            # help typing tool to see it too :-)
+            if isinstance(data, ValueRange):
+                value = data.first()
+            else:
+                raise RuntimeError("returned data must be of type ValueRange")
+
         except KeyError:
             value = ""
 
@@ -2209,7 +2213,7 @@ def _finder(
             str_query = query
 
             def match(x: Cell) -> bool:
-                if case_sensitive:
+                if case_sensitive or x.value is None:
                     return x.value == str_query
                 else:
                     return x.value.casefold() == str_query.casefold()