"Run query" button should be disable meanwhile a query is in process.

**Observation**: I tried clicking the "run query" button multiple times while a query was processing, Meanwhile it processed the empty queries and resulted in "Query not entered!" multiple times.
It can be annoying for the user when a query takes much time to process and the user keeps clicking the button.

**Recommendation**: "Button should be disabled until the previous query is being processed".
"**Procedure**": I throttled the browser to 3G, and run a single query, and clicked the "run query" button multiple times.