Properties with defaults cannot be set to null anymore.

[renefloor]

:sparkles: What kind of change does this PR introduce? (Bug fix, feature, docs update...)

bug fix

:arrow_heading_down: What is the current behavior?

When you pass down parameters you sometimes accidentally pass down a null value. This should crash the app, but just be set as the default value.

:new: What is the new behavior (if this is a feature change)?

Default values are set when property is null.

:boom: Does this PR introduce a breaking change?

No

:bug: Recommendations for testing

:memo: Links to relevant issues/docs

:thinking: Checklist before submitting

• [X] All projects build
• [X] Follows style guide lines
• [X] Relevant documentation was updated
• [X] Rebased onto current develop

[codecov[bot]]

Codecov Report

Merging #3 into develop will increase coverage by 3.34%. The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           develop       #3      +/-   ##
===========================================
+ Coverage    39.51%   42.85%   +3.34%     
===========================================
  Files            7        7              
  Lines          205      189      -16     
===========================================
  Hits            81       81              
+ Misses         124      108      -16     

Impacted Files	Coverage Δ
lib/src/image.dart	55.88% <50.00%> (+7.57%)	:arrow_up:

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