drawing pathways is omitted during conversion to image

checked on the map: alpha.xml

There is difference in converting to image between MINERVA export and API converter. Also, API conversion depends on CellDesigner layers (if file is saved with layers invisible or visible).
In case the file was saved with visible layers in CellDesigner, converter does not draw the rectangular (pathway) and puts all text from the layer. If layers in CellD are invisible, then converter omits the layer (no text or rectangular are drawn).

I believe, to keep consistency, API conversion should draw rectangular (pathway) in case either the layers are invisible or visible, it should not matter.

@marek.ostaszewski Currently, MINERVA displays in the pathway only the first row of text (see last image). Is it correct behaviour? The rest of the text in displayed in the left panel.

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