Can now use pipeline as query

client/coffee/filters.coffee

@@ -6,7 +6,9 @@ root.filters.filter 'escape', () ->
 
 root.filters.filter 'replaceAllCommasBySpaces', () ->
   return (text) ->
-      return text.replace(new RegExp(",","g"), " ")
+      if _.isString(text)
+          return text.replace(new RegExp(",","g"), " ")
+      return text
 
 root.filters.filter 'niceJSON', () ->
   return (obj) ->
@@ -21,4 +23,4 @@ root.filters.filter 'onlyNthLines', () ->
         if not _.isString(text)
             return ""
         s = text.split("\n")
-        return s[0...n].join("\n")
+        return s[0...n].join("\n")