Assembly: deleting a component deletes its joints.

src/Mod/Assembly/JointObject.py

@@ -941,6 +941,9 @@ class ViewProviderJoint:
 
         return True
 
+    def canDelete(self, _obj):
+        return True
+
 
 ################ Grounded Joint object #################
 
@@ -1143,6 +1146,9 @@ class ViewProviderGroundedJoint:
                 Since no data were serialized nothing needs to be done here."""
         return None
 
+    def canDelete(self, _obj):
+        return True
+
 
 class MakeJointSelGate:
     def __init__(self, taskbox, assembly):