Fix: Initialize fields with default values

[localheinz]

This PR

• initializes fields with default values to avoid type errors

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@b556041). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             master      #266   +/-   ##
==========================================
  Coverage          ?   100.00%           
  Complexity        ?       147           
==========================================
  Files             ?        33           
  Lines             ?       472           
  Branches          ?         0           
==========================================
  Hits              ?       472           
  Misses            ?         0           
  Partials          ?         0           

Impacted Files	Coverage Δ	Complexity Δ
src/Exception/InvalidIndentSizeException.php	100.00% <ø> (ø)	3.00 <0.00> (?)
src/Exception/InvalidIndentStringException.php	100.00% <ø> (ø)	2.00 <0.00> (?)
src/Exception/InvalidIndentStyleException.php	100.00% <ø> (ø)	3.00 <0.00> (?)
...rc/Exception/InvalidJsonEncodeOptionsException.php	100.00% <ø> (ø)	2.00 <0.00> (?)
src/Exception/InvalidJsonEncodedException.php	100.00% <ø> (ø)	2.00 <0.00> (?)
src/Exception/InvalidNewLineStringException.php	100.00% <ø> (ø)	2.00 <0.00> (?)
...on/NormalizedInvalidAccordingToSchemaException.php	100.00% <ø> (ø)	2.00 <0.00> (?)
...tion/OriginalInvalidAccordingToSchemaException.php	100.00% <ø> (ø)	2.00 <0.00> (?)
src/Exception/SchemaUriCouldNotBeReadException.php	100.00% <ø> (ø)	2.00 <0.00> (?)
...Exception/SchemaUriCouldNotBeResolvedException.php	100.00% <ø> (ø)	2.00 <0.00> (?)
... and 35 more

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