Added null check for Offline LOI

[anandwana001]

Fixes #2773

Earlier app crash when any offline LOI is not available. Added Null check of such LOI access logic

@shobhitagarwal1612 @sufyanAbbasi PTAL?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 21.87500% with 25 lines in your changes missing coverage. Please review.

Project coverage is 61.89%. Comparing base (c3ad147) to head (7819f36). Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
.../android/ground/repository/SubmissionRepository.kt	0.00%	15 Missing :warning:
.../ground/repository/LocationOfInterestRepository.kt	37.50%	2 Missing and 3 partials :warning:
...ndroid/ground/ui/syncstatus/SyncStatusViewModel.kt	20.00%	4 Missing :warning:
...round/ui/datacollection/DataCollectionViewModel.kt	75.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2788      +/-   ##
============================================
- Coverage     61.96%   61.89%   -0.08%     
  Complexity     1166     1166              
============================================
  Files           265      265              
  Lines          6223     6235      +12     
  Branches        877      883       +6     
============================================
+ Hits           3856     3859       +3     
- Misses         1840     1847       +7     
- Partials        527      529       +2     

Files with missing lines	Coverage Δ
...round/ui/datacollection/DataCollectionViewModel.kt	71.57% <75.00%> (-0.37%)	:arrow_down:
...ndroid/ground/ui/syncstatus/SyncStatusViewModel.kt	45.45% <20.00%> (-7.18%)	:arrow_down:
.../ground/repository/LocationOfInterestRepository.kt	50.87% <37.50%> (-0.11%)	:arrow_down:
.../android/ground/repository/SubmissionRepository.kt	19.51% <0.00%> (-1.01%)	:arrow_down:

[gino-m]

Earlier app crash when any offline LOI is not available.

Do you mean "when no LOIs are available offline"?

[kenstershiro]

@sufyanAbbasi to try to take a look at the PR approval in @gino-m 's absence