Skip formatting when during format-on-save, the configured formatter …

…cannot be found (continue to show silent notification), #106376

src/vs/editor/contrib/format/format.ts

@@ -116,7 +116,7 @@ export abstract class FormattingConflicts {
  if (selector) {
  return await selector(formatter, document, mode);
  }
- return formatter[0];
+ return undefined;
  }
 }
 

src/vs/workbench/contrib/format/browser/formatActionsMultiple.ts

@@ -121,7 +121,7 @@ class DefaultFormatter extends Disposable implements IWorkbenchContribution {
  if (silent) {
  // don't wait when formatting happens without interaction
  // but pick some formatter...
- resolve(formatter[0]);
+ resolve(undefined);
  }
  });
  }