Making capability required in the get versions request

services/capability/capability/views/casa_matrix.py

@@ -72,9 +72,13 @@ def get_casa_versions(request: Request) -> Response:
         or a 404 response (HTTPNotFound) if none are returned
     """
     body = parse_body(request)
+
+    if "capability" not in body:
+        return HTTPBadRequest(detail=f"Capability not given")
+
     params = {
         "version": body["version"] if "version" in body else None,
-        "capability": body["capability"] if "capability" in body else None,
+        "capability": body["capability"],
         "telescope": body["telescope"] if "telescope" in body else None,
     }
     params = {k: v for k, v in params.items() if v is not None}