Bug: validation of handle with NULL is missing in some L1 & L2 test cases

[srinivasgtl]

Problem/Opportunity

Check for the L1 and L2 test cases where handle is not validated with NULL. As this happened in few modules, its better to have a check on all the modules and fix them.

Steps to reproduce

This is a validation check and first we need to go through the code and do the visual analysis.

Expected Behavior

handle should be validated with NULL for each test case
UT_ASSERT_NOT_EQUAL_FATAL(handle, 0)

Actual Behavior

All NULL exceptions should be handled correctly.

Notes (Optional)

No response