fix: use None check instead of falsy (#4705)

openhands/runtime/plugins/agent_skills/file_editor/impl.py

@@ -46,13 +46,13 @@ def __call__(
         if command == 'view':
             return self.view(_path, view_range)
         elif command == 'create':
-            if not file_text:
+            if file_text is None:
                 raise ToolError('Parameter `file_text` is required for command: create')
             self.write_file(_path, file_text)
             self._file_history[_path].append(file_text)
             return ToolResult(output=f'File created successfully at: {_path}')
         elif command == 'str_replace':
-            if not old_str:
+            if old_str is None:
                 raise ToolError(
                     'Parameter `old_str` is required for command: str_replace'
                 )
@@ -62,7 +62,7 @@ def __call__(
                 raise ToolError(
                     'Parameter `insert_line` is required for command: insert'
                 )
-            if not new_str:
+            if new_str is None:
                 raise ToolError('Parameter `new_str` is required for command: insert')
             return self.insert(_path, insert_line, new_str)
         elif command == 'undo_edit':