GET /workflow/<serverID> returns incorrect response for missing IDs (should be 404)

[Titas-Ghosh]

Hi @pradeeban ,
I found a mismatch between model and controller handling for missing workflows.
Right now, WorkFlowModel.get() returns (False, 'Record Not Found'), but getWorkflow() only checks for None. Because of that, a missing ID doesn’t cleanly return 404 in all cases.

Any non-existent workflow ID should always return 404 Not Found (with a consistent error message), including when X-Latest-Hash is sent.

Fix

Use one consistent not-found contract:

• Either return None from WorkFlowModel.get() and keep controller check as-is, or
• Keep tuple return and update controller to handle it explicitly before parsing/response construction.

[github-actions]

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[Titas-Ghosh]

I have implemented the fix in PR #326 , i have standardized the missing-workflow handling so GET /workflow/<id> consistently returns 404 Not Found (including legacy tuple compatibility in controller).
Also added regression tests for missing-ID (None + legacy tuple) and hash-check paths.
kindly review when you get a chance @pradeeban . Thanks!