[YUNIKORN-2859] fix: missing assertion in TestGetApplicationHandler

[ryankert01]

What is this PR for?

our current code cannot verify *dao.ApplicationDAOInfo, both empty and legit app can pass the test. we should fix that.

What type of PR is it?

• - Bug Fix
• - Improvement
• - Feature
• - Documentation
• - Hot Fix
• - Refactoring

Todos

• - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-2859

How should this be tested?

Screenshots (if appropriate)

Questions:

• - The licenses files need update.
• - There is breaking changes for older versions.
• - It needs documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.97%. Comparing base (6939b13) to head (c884e64).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #965      +/-   ##
==========================================
+ Coverage   80.41%   80.97%   +0.56%     
==========================================
  Files          97       97              
  Lines       12431    12514      +83     
==========================================
+ Hits         9996    10133     +137     
+ Misses       2164     2112      -52     
+ Partials      271      269       -2     

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[craigcondit]

+1 LGTM.