Fixed error in GCode viewer where multiple filaments available (e.g. … #3053
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What does this PR do and why is it necessary?
When multiple filaments are available (e.g. using a Prusa MMU2), but you are printing with say filament 4 only, the GCode Viewer throws errors as it loops over all filaments set on the layer - the unused ones are undefined and an exception gets generated). This causes the layer height slider to not get updated correctly.
How was it tested? How can it be tested by the reviewer?
Tested on with Prusa MK3 with MMU2.
Any background context you want to provide?
What are the relevant tickets if any?
Screenshots (if appropriate)
N/A
Further notes
Fix is just to add check if filament is not undefined before using it