Andreas Brinner a6e29e32ae Check return value of getMDIViewPage() a second time ...

When exporting a hidden TechDraw::Page with exportPageAs[Pdf|SVG] a
Segmentation Fault occured.

The return value of getMDIViewPage() was only checked for the first call, but
not for the second call. showMDIViewPage() silently returns, when the
TechDraw::Page is hidden and does not load the page.

2020-12-09 11:21:59 +01:00

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