fix(blocks): prevent TypeError when auto_credentials field is empty

When a GoogleDriveFileField input (e.g. spreadsheet) is empty/None, the
executor skips credential injection. The block's run() is then called
without the required `credentials` kwarg, causing a TypeError wrapped as
BlockUnknownError.

Fix in two layers:
- _base.py: inject None for missing auto_credentials kwargs in _execute()
  so all GoogleDriveFileField blocks get a clean fallback
- GoogleSheetsReadBlock: accept optional credentials and guard against None

Fixes OPEN-2895

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

autogpt_platform/backend/backend/blocks/_base.py

@@ -706,6 +706,13 @@ class Block(ABC, Generic[BlockSchemaInputType, BlockSchemaOutputType]):
                 block_id=self.id,
             )
 
+        # Ensure auto_credentials kwargs are present (even as None) so blocks
+        # that declare e.g. `*, credentials: GoogleCredentials` as a required
+        # kwarg don't crash with TypeError when the execution context didn't
+        # resolve credentials (e.g. the GoogleDriveFile field was empty).
+        for kwarg_name in self.input_schema.get_auto_credentials_fields():
+            kwargs.setdefault(kwarg_name, None)
+
         # Use the validated input data
         async for output_name, output_data in self.run(
             self.input_schema(**{k: v for k, v in input_data.items() if v is not None}),

autogpt_platform/backend/backend/blocks/google/sheets.py

@@ -326,11 +326,18 @@ class GoogleSheetsReadBlock(Block):
         )
 
     async def run(
-        self, input_data: Input, *, credentials: GoogleCredentials, **kwargs
+        self,
+        input_data: Input,
+        *,
+        credentials: GoogleCredentials | None = None,
+        **kwargs,
     ) -> BlockOutput:
         if not input_data.spreadsheet:
             yield "error", "No spreadsheet selected"
             return
+        if not credentials:
+            yield "error", "Google credentials are required"
+            return
 
         # Check if the selected file is actually a Google Sheets spreadsheet
         validation_error = _validate_spreadsheet_file(input_data.spreadsheet)

autogpt_platform/backend/backend/blocks/google/sheets_test.py

@@ -0,0 +1,18 @@
+"""Tests for Google Sheets blocks — edge cases around credentials handling."""
+
+import pytest
+
+from backend.blocks.google.sheets import GoogleSheetsReadBlock
+from backend.util.exceptions import BlockExecutionError
+
+
+async def test_sheets_read_no_spreadsheet_yields_clean_error():
+    """Executing GoogleSheetsReadBlock with no spreadsheet/credentials should
+    raise a clean BlockExecutionError, not a BlockUnknownError wrapping a
+    TypeError about a missing kwarg."""
+    block = GoogleSheetsReadBlock()
+    input_data = {"range": "Sheet1!A1:B2"}  # no spreadsheet, no credentials
+
+    with pytest.raises(BlockExecutionError, match="No spreadsheet selected"):
+        async for _ in block.execute(input_data):
+            pass