Search for space characters throws error: "Failed to query: fts5: syntax error near """
Steps to reproduce:
- Start search, e.g. with Ctrl-F
- Select source "Local"
- Type one or more space characters
- Press Enter
- Error message dialog shown: 'Search Error', 'Failed to query: fts5: syntax error near ""'
- Headerbar title is 'Results for " "'
- Search should be ignored
- Headerbar title should not indicate a search