[pgAdmin4][Patch]: RM1595 - "no results to fetch error" displayed if modify definition with other table

Hi

1) Creating a m-view with definition and then updating view with new definition, it results into an error "No results to fetch".

2) When definition of m-view is updated, it creates a new m-view with different OID, but it wasn't updating the old OID with new OID of tree node in tree view. thus on switching to another tab (e.g.: sql), it throws message "Cannot find materialized view".

Please find attached patch and review.

Thanks,

Surinder Kumar