Error opening reclassify tool when layers are loaded in Data Sources

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An error has occurred while executing Python code: 

TypeError: object of type 'NoneType' has no len() 
Traceback (most recent call last):
  File "C:\Users\ThinkPad\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\enmapboxplugin\enmapbox\coreapps\reclassifyapp\enmapboxintegration.py", line 56, in startGUI
    uiDialog = ui.ReclassifyDialog(self.enmapbox.ui)
  File "C:\Users\ThinkPad\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\enmapboxplugin\enmapbox\coreapps\reclassifyapp\reclassifydialog.py", line 45, in __init__
    self.updateExceptedLayerList()
  File "C:\Users\ThinkPad\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\enmapboxplugin\enmapbox\coreapps\reclassifyapp\reclassifydialog.py", line 101, in updateExceptedLayerList
    if len(cs) == 0:
TypeError: object of type 'NoneType' has no len()

## different variant

An error has occurred while executing Python code: 

TypeError: object of type 'NoneType' has no len() 
Traceback (most recent call last):
  File "C:\Users\ThinkPad\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\enmapboxplugin\enmapbox\coreapps\reclassifyapp\reclassifydialog.py", line 101, in updateExceptedLayerList
    if len(cs) == 0:
TypeError: object of type 'NoneType' has no len()

## different variant

An error has occurred while executing Python code: 

TypeError: object of type 'NoneType' has no len() 
Traceback (most recent call last):
  File "C:\Users\ThinkPad\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\enmapboxplugin\enmapbox\coreapps\reclassifyapp\enmapboxintegration.py", line 56, in startGUI
    uiDialog = ui.ReclassifyDialog(self.enmapbox.ui)
  File "C:\Users\ThinkPad\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\enmapboxplugin\enmapbox\coreapps\reclassifyapp\reclassifydialog.py", line 45, in __init__
    self.updateExceptedLayerList()
  File "C:\Users\ThinkPad\AppData\Roaming\QGIS\QGIS3\profiles\default\python\plugins\enmapboxplugin\enmapbox\coreapps\reclassifyapp\reclassifydialog.py", line 101, in updateExceptedLayerList
    if len(cs) == 0:
TypeError: object of type 'NoneType' has no len()
Version 3.6.20200402T180442.develop
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