Moved dp and view null-check to basecontroller

[gbenziv]

xxxx

Since the dp and view instances were moved to the basecontroller, it would make sense for the null-check to be in that class as well.

Pull Request Checklist

• [x] I have ensured that my commit message contains the Issue ID.
• [x] I have ensured that my commit message contains the feature/bugfix description.
• [ ] I have updated the documentation accordingly.
• [x] I have ensured my code follows the coding guidelines.
• [x] I have ran lint in my code locally prior to submission.
• [x] I have built my changes in local successfully.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #200 (2ef5d24) into master (ed97599) will increase coverage by 0.23%. The diff coverage is 95.94%.

@@            Coverage Diff             @@
##           master     #200      +/-   ##
==========================================
+ Coverage   95.33%   95.56%   +0.23%     
==========================================
  Files          45       51       +6     
  Lines         900     1037     +137     
==========================================
+ Hits          858      991     +133     
- Misses         42       46       +4     

Impacted Files	Coverage Δ
core/domain/common/cachecontroller.hpp	100.00% <ø> (ø)
...omain/customermgmt/interface/customermgmtiface.hpp	100.00% <ø> (ø)
core/domain/dashboard/interface/dashboardiface.hpp	100.00% <ø> (ø)
core/domain/inventory/interface/inventoryiface.hpp	100.00% <ø> (ø)
core/domain/inventory/inventorycontroller.hpp	100.00% <ø> (ø)
core/domain/userlogin/interface/loginiface.hpp	100.00% <ø> (ø)
core/entity/employee.hpp	100.00% <ø> (ø)
core/validator/productvalidator.hpp	100.00% <ø> (ø)
core/domain/unittest/test_inventory.cpp	96.66% <93.18%> (-3.34%)	:arrow_down:
core/domain/common/basecontroller.hpp	100.00% <100.00%> (ø)
... and 13 more

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