NullPointerException Multi-level inheritance fixes #41#45

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DarrenC wants to merge 2 commits intokicksolutions:masterfrom DarrenC:NPE_inheritance_fix_branch

+1,576-14

Commits on Jun 14, 2019

Fix for NPE with multiple class inheritance - taken from solution in kicksolutions#41
dcostello
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Commits on Jun 25, 2019

fixes #1 and adds unit tests
dcostello
committed