Don't show empty "Deprecated" node category menu

blender/arm/logicnode/deprecated/LN_quaternion.py

@@ -7,6 +7,7 @@ class QuaternionNode(ArmLogicTreeNode):
     bl_idname = 'LNQuaternionNode'
     bl_label = 'Quaternion'
     bl_description = 'Create a quaternion variable (transported through a vector socket)'
+    arm_category = 'Variable'
     arm_section = 'quaternions'
     arm_version = 2  # deprecate
 

blender/arm/logicnode/deprecated/LN_separate_quaternion.py

@@ -6,6 +6,7 @@ class SeparateQuaternionNode(ArmLogicTreeNode):
     bl_idname = 'LNSeparateQuaternionNode'
     bl_label = "Separate Quaternion (do not use: quaternions sockets have been phased out entirely)"
     bl_description = "Separate a quaternion object (transported through a vector socket) into its four compoents."
+    arm_category = 'Math'
     arm_section = 'quaternions'
     arm_version = 2  # deprecate
     

blender/arm/logicnode/deprecated/LN_surface_coords.py

@@ -9,7 +9,6 @@ class SurfaceCoordsNode(ArmLogicTreeNode):
     bl_description = "Please use the \"Get Touch Movement\" and \"Get Touch Location\" nodes instead"
     arm_category = 'Input'
     arm_section = 'surface'
-    arm_is_obsolete = 'is_obsolete'
     arm_version = 2
 
     def arm_init(self, context):