deal with null return for create deployment plan for maintenance

[DaanHoogland]

Description

This PR...

Fixes: #9887

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?

[DaanHoogland]

@blueorangutan package

[blueorangutan]

@DaanHoogland a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[codecov]

Codecov Report

Attention: Patch coverage is 3.44828% with 84 lines in your changes missing coverage. Please review.

Project coverage is 15.16%. Comparing base (b41acf2) to head (2c7f950).
Report is 10 commits behind head on 4.19.

Files with missing lines	Patch %	Lines
...n/java/com/cloud/resource/ResourceManagerImpl.java	3.44%	84 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.19   #10518      +/-   ##
============================================
- Coverage     15.17%   15.16%   -0.01%     
+ Complexity    11332    11329       -3     
============================================
  Files          5414     5414              
  Lines        474802   474785      -17     
  Branches      57909    57907       -2     
============================================
- Hits          72028    72019       -9     
+ Misses       394718   394712       -6     
+ Partials       8056     8054       -2     

Flag	Coverage Δ
uitests	4.28% <ø> (ø)
unittests	15.89% <3.44%> (-0.01%)	⬇️

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[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ debian ✔️ suse15. SL-JID 12685

[DaanHoogland]

@blueorangutan test

[blueorangutan]

@DaanHoogland a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

[blueorangutan]

[SF] Trillian Build Failed (tid-12602)

[bernardodemarco]

clgtm

[DaanHoogland]

@blueorangutan package

[blueorangutan]

@DaanHoogland a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ debian ✔️ suse15. SL-JID 12700

[DaanHoogland]

@blueorangutan test

[blueorangutan]

@DaanHoogland a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

[blueorangutan]

[SF] Trillian test result (tid-12618)
Environment: kvm-ol8 (x2), Advanced Networking with Mgmt server ol8
Total time taken: 56804 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr10518-t12618-kvm-ol8.zip
Smoke tests completed. 133 look OK, 0 have errors, 0 did not run
Only failed and skipped tests results shown below:

Test	Result	Time (s)	Test File

[Pearl1594]

code lgtm