#207 Don't crash SvgViewer if SVG file can't be loaded.

Merged Dennis Hendriks requested to merge 207-nullpointerexception-in-case-of-svg-load-error into develop
  • Prevent NullPointerException.
  • Show error in SVG visualizer.
  • Properly forward error to Chi/CIF simulator.

Closes #207 (closed)

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