[BUG] SPARQL Status Magic Should Not Require Query ID

[triggan]

Describe the bug
When using the %sparql_status magic without a specified query ID, it should return a list of all running queries and a number of accepted (but not running) queries. Instead, it currently returns the following error:

{'error': ValueError('query_id must be a non-empty string')}

To Reproduce

1. Create a new cell in any notebook.
2. Insert the %sparql_status magic with no other parameters.
3. Run the cell.

Expected behavior
Running the %sparql_status magic without parameters should return a data structure of the following:

{
  "acceptedQueryCount": 12,
  "runningQueryCount": 0,
  "queries": []
}

Desktop (please complete the following information):

• OS: MacOSX BigSur
• Browser: Firefox
• Version: Graph-Notebook 3.5.1