re-enable slice button upon error
re-enable slice button upon error

kennethjiang/OctoPrint-Slicer,eyal0/OctoPrint-Slicer,eyal0/OctoPrint-Slicer,kennethjiang/OctoPrint-Slicer,eyal0/OctoPrint-Slicer,kennethjiang/OctoPrint-Slicer