Fixed problem with nullable relations.

[butschster]

Related to: cycle/migrations#17 and cycle/orm#120

[codecov]

Codecov Report

Merging #29 (016feda) into master (4ae16d2) will increase coverage by 0.09%.
The diff coverage is 89.47%.

@@             Coverage Diff              @@
##             master      #29      +/-   ##
============================================
+ Coverage     92.30%   92.39%   +0.09%     
  Complexity      426      426              
============================================
  Files            33       33              
  Lines          1065     1065              
============================================
+ Hits            983      984       +1     
+ Misses           82       81       -1     

Impacted Files	Coverage Δ
src/Relation/Traits/MorphTrait.php	93.10% <83.33%> (ø)
src/Relation/Traits/FieldTrait.php	65.51% <92.30%> (+3.44%)	⬆️

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