Fix NPE during reset password

[sureshanaparti]

Description

This PR fixes the NPE during reset password, and has some code improvements. Failed to throw proper error when there is no session while resetting password.

Fixes #12582

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[sureshanaparti]

@blueorangutan package

[codecov]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 16.26%. Comparing base (9ae696d) to head (1001510).

Files with missing lines	Patch %	Lines
...ack/api/command/SAML2LoginAPIAuthenticatorCmd.java	0.00%	6 Missing ⚠️
...loud/api/auth/DefaultLoginAPIAuthenticatorCmd.java	0.00%	3 Missing ⚠️
server/src/main/java/com/cloud/api/ApiServlet.java	0.00%	1 Missing and 1 partial ⚠️
...th2/api/command/OauthLoginAPIAuthenticatorCmd.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.20   #12585      +/-   ##
============================================
- Coverage     16.26%   16.26%   -0.01%     
  Complexity    13428    13428              
============================================
  Files          5660     5660              
  Lines        499963   499965       +2     
  Branches      60708    60709       +1     
============================================
  Hits          81330    81330              
- Misses       409559   409562       +3     
+ Partials       9074     9073       -1     

Flag	Coverage Δ
uitests	4.16% <ø> (ø)
unittests	17.12% <0.00%> (-0.01%)	⬇️

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[sudo87]

clgtm