mrview: outside FOV: set value_min and value_max to zero #943
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Proposed fix for #940:
mrview: src/gui/mrview/displayable.h:309: void MR::GUI::MRView::Displayable::update_levels(): Assertionstd::isfinite (value_min)' failed.I added
value_min = 0.0f;andvalue_max = 0.0f;for all colourmaps in case the cursor is outside the FOV. This gives nan as lower and upper limit for the colourbar which I think is sensible.