Setting skill level to zero removes it

person.py

@@ -88,6 +88,7 @@ def setProfileImage(baseDir: str,httpPrefix :str,nickname: str,domain: str, \
 def setSkillLevel(baseDir: str,nickname: str,domain: str, \
                   skill: str,skillLevelPercent: int) -> bool:
     """Set a skill level for a person
+    Setting skill level to zero removes it
     """
     if skillLevelPercent<0 or skillLevelPercent>100:
         return False
@@ -96,7 +97,10 @@ def setSkillLevel(baseDir: str,nickname: str,domain: str, \
         return False
     with open(actorFilename, 'r') as fp:
         actorJson=commentjson.load(fp)
+        if skillLevelPercent>0:
             actorJson['skills'][skill]=skillLevelPercent
+        else:
+            del actorJson['skills'][skill]
         with open(actorFilename, 'w') as fp:
             commentjson.dump(actorJson, fp, indent=4, sort_keys=False)    
     return True