Add extra unittests for NullPropagation / ToString / AllowEqualsAndToStringMethodsOnObject is true#925

StefH merged 2 commits intomasterzzzprojects/System.Linq.Dynamic.Core:masterfrom

stef-924-AllowEqualsAndToStringMethodsOnObjectzzzprojects/System.Linq.Dynamic.Core:stef-924-AllowEqualsAndToStringMethodsOnObjectCopy head branch name to clipboard