Task#21 improve oscm approval coverage

[Piotr-K8i]

Changes in this Pull Request:

Mandatory checks:

• [ ] latest changes were fetched from the upstream branch before creating this PR (branch is up to date)
• [ ] changes were tested manually
• [ ] unit tests were properly implemented
• [ ] communication about interdependent changes has been sent to the team (if applicable)
• [ ] respective Jenkins jobs were referenced in additional context section of this PR

OSCM Build References:

• [OSCM Build And Push job]()
• [OSCM Pull And Start job]()

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This change is 

[codecov[bot]]

Codecov Report

Merging #106 (cd09bc8) into master (9ec7957) will increase coverage by 0.64%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
+ Coverage   48.92%   49.57%   +0.64%     
==========================================
  Files         262      262              
  Lines       16703    16703              
  Branches     2190     2190              
==========================================
+ Hits         8172     8280     +108     
+ Misses       7975     7859     -116     
- Partials      556      564       +8     

Impacted Files	Coverage Δ
...pp/approval/controller/ApprovalInstanceAccess.java	80.67% <0.00%> (+13.44%)	:arrow_up:
...c/main/java/org/oscm/app/approval/data/Server.java	29.03% <0.00%> (+29.03%)	:arrow_up:
...a/org/oscm/app/approval/controller/Dispatcher.java	57.14% <0.00%> (+57.14%)	:arrow_up:
.../approval/controller/ApprovalControllerAccess.java	60.00% <0.00%> (+60.00%)	:arrow_up:
.../oscm/app/approval/controller/PropertyHandler.java	75.00% <0.00%> (+75.00%)	:arrow_up:
...cm/app/approval/controller/ApprovalController.java	75.00% <0.00%> (+75.00%)	:arrow_up:
...rc/main/java/org/oscm/app/approval/data/State.java	100.00% <0.00%> (+100.00%)	:arrow_up: