[Enhanced Multiband Color Renderer app] selection buttons aren't working

[Andreas Rabe]

Reported by Henrike.

Not 100% sure, but I think the “Select All” and “Clear Selection” buttons are not working, because nothing happens when I click it.

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[Fabian Thiel]

Can confirm this

2022-04-13T08:53:48     WARNING    Traceback (most recent call last):
              File "/root/.local/share/QGIS/QGIS3/profiles/default/python/plugins/enmapboxplugin/enmapbox/coreapps/enhancedmultibandcolorapp/enhancedmultibandcolordialog.py", line 151, in onSelectAllClicked
              assert 0
             AssertionError

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[Andreas Rabe]

https://github.com/EnMAP-Box/enmap-box/commit/4a5e43a5869743a95543b695f0d5e64afbe87e7d