Don't do undefined slug collection scans

app/core/utils.coffee

@@ -250,6 +250,7 @@ module.exports.getPrepaidCodeAmount = getPrepaidCodeAmount = (price=999, users=0
   total
 
 module.exports.filterMarkdownCodeLanguages = (text) ->
+  return '' unless text
   currentLanguage = me.get('aceConfig')?.language or 'python'
   excludedLanguages = _.without ['javascript', 'python', 'coffeescript', 'clojure', 'lua', 'io'], currentLanguage
   exclusionRegex = new RegExp "```(#{excludedLanguages.join('|')})\n[^`]+```\n?", 'gm'

app/views/ladder/SimulateTabView.coffee

@@ -64,6 +64,7 @@ module.exports = class SimulateTabView extends CocoView
       # Work around simulator getting super slow on Chrome
       fetchAndSimulateTaskOriginal = @simulator.fetchAndSimulateTask
       @simulator.fetchAndSimulateTask = =>
+        return if @destroyed
         if @simulator.simulatedByYou >= 20
           console.log '------------------- Destroying  Simulator and making a new one -----------------'
           @simulator.destroy()

app/views/play/level/tome/SpellView.coffee

@@ -284,7 +284,7 @@ module.exports = class SpellView extends CocoView
             ar = str.match(/^\s*/)
             ar.pop().length
 
-          colors = ['50,150,200', '200,150,50']
+          colors = [{border: '74,144,226', fill: '108,162,226'}, {border: '132,180,235', fill: '230,237,245'}]
 
           for row in [0..@aceSession.getLength()]
             foldWidgets[row] = @aceSession.getFoldWidget(row) unless foldWidgets[row]?
@@ -316,17 +316,19 @@ module.exports = class SpellView extends CocoView
             w = 4 * config.characterWidth
             fw = config.characterWidth * ( @aceSession.getScreenLastRowColumn(range.start.row) - xstart )
 
-            html.push [
-              '<div style="',
-              "position: absolute; top: #{to}px; left: #{l}px; width: #{fw+bw}px; height: #{config.lineHeight}px; background-color: rgba(#{color},0.2);"
-              "border: #{bw}px solid rgba(#{color},0.4); border-left: none",
-              '"></div>' ].join ''
-
-            html.push [
-              '<div style="',
-              "position: absolute; top: #{t}px; left: #{l}px; width: #{w}px; height: #{h}px; background-color: rgba(#{color},0.2);"
-              "border-right: #{bw}px solid rgba(#{color},0.4);",
-              '"></div>' ].join ''
+            html.push """
+              <div style=
+                "position: absolute; top: #{to}px; left: #{l}px; width: #{fw+bw}px; height: #{config.lineHeight}px;
+                 border: #{bw}px solid rgba(#{color.border},1); border-left: none;"
+              ></div>
+              <div style=
+                "position: absolute; top: #{t}px; left: #{l}px; width: #{w}px; height: #{h}px; background-color: rgba(#{color.fill},0.5);
+                 border-right: #{bw}px solid rgba(#{color.border},1); border-bottom: #{bw}px solid rgba(#{color.border},1);"
+              ></div>
+              <div style=
+                "position: absolute; top: #{t + h}px; left: #{l}px; width: #{500}px; height: #{bw}px; background-color: rgba(#{color.border},1);"
+              ></div>
+            """
 
   fillACE: ->
     @ace.setValue @spell.source

server/commons/Handler.coffee

@@ -504,6 +504,7 @@ module.exports = class Handler
       if not idOrSlug or idOrSlug is 'undefined'
         console.error "What? Why are we fetching the slug: #{idOrSlug}?"
         console.trace()
+        return done null, null
       query = @modelClass.findOne {slug: idOrSlug}
     query.select projection if projection
     query.exec (err, document) ->