Fix Update CLI command for Stored Procedure

[abhishekkumams]

Why make this change?

• Closes Issue while updating Stored Procedure using CLI #986
• This change will fix the issue of losing parameters after updating an entity with stored-procedure type

What is this change?

• because of using IEnumerable, the fields are not null, instead they're empty IEnumerable List, hence our cli used to think it's a new value from user which removes all the current parameters.
• We updated the check with Enumerable.Any() along with null, to not change the parameters if nothing is provided from user.

How was this tested?

• Unit Tests

Steps To Verify

Initializing and adding a stored procedure entity

dab init -c test.json --database-type mssql
dab add Sptest -c test.json --source s001.test --source.type "stored-procedure" --source.params "id:1,name:Abhi" --permissions "anonymous:read"

Output

{
            "type": "stored-procedure",
            "object": "s001.test",
            "parameters": {
                "param1": 123,
                "param2": "hello",
                "param3": true
            }
 }

updating the source name

dab add Sptest -c test.json --source dbo.sptest
Output

{
            "type": "stored-procedure",
            "object": "dbo.sptest",
            "parameters": {
                "param1": 123,
                "param2": "hello",
                "param3": true
            },
            "key-fields": []
 }

[Aniruddh25]

nit: since its a stored procedure, why do we even bother to mention key-fields here?