Re-denormalize session if things have changed. Removed some logs.

app/lib/LevelLoader.coffee

@@ -110,16 +110,19 @@ module.exports = class LevelLoader extends CocoClass
     @updateCompleted = true
 
   denormalizeSession: ->
-    return if @session.get 'levelName'
+    return if @sessionDenormalized
     patch =
       'levelName': @level.get('name')
       'levelID': @level.get('slug') or @level.id
     if me.id is @session.get 'creator'
       patch.creatorName = me.get('name')
-
-    @session.set key, value for key, value of patch
-    tempSession = new LevelSession _id: @session.id
-    tempSession.save(patch, {patch: true})
+    for key, value of patch
+      if @session.get(key) is value
+        delete patch[key]
+    unless _.isEmpty patch
+      @session.set key, value for key, value of patch
+      tempSession = new LevelSession _id: @session.id
+      tempSession.save(patch, {patch: true})
     @sessionDenormalized = true
 
   # World init

app/views/play/level_view.coffee

@@ -141,17 +141,13 @@ module.exports = class PlayLevelView extends View
 
     otherSession = @levelLoader.opponentSession
     opponentCode = otherSession?.get('submittedCode') or {}
-    console.log "otherSession", otherSession, "opponentSpells", opponentSpells
     myCode = @session.get('code') or {}
     for spell in opponentSpells
       [thang, spell] = spell.split '/'
       c = opponentCode[thang]?[spell]
-      console.log "Got opponent code", c, "for", spell, "and had my code", myCode[spell]
       myCode[thang] ?= {}
       if c then myCode[thang][spell] = c else delete myCode[thang][spell]
-    console.log "Going to set session code from", _.cloneDeep(myCode)
     @session.set('code', myCode)
-    console.log "Just set session code to", _.cloneDeep(@session.get('code'))
     if @session.get('multiplayer') and otherSession?
       # For now, ladderGame will disallow multiplayer, because session code combining doesn't play nice yet.
       @session.set 'multiplayer', false