Make sure linter doesn't use removed files

build_script.sh

@@ -6,18 +6,19 @@ if [[ $files = *"bigbluebutton-html5"* ]]; then
   cd bigbluebutton-html5
   curl https://install.meteor.com/ | sh
   meteor npm install
+  cd ..
   if [ $1 = linter ]
   then
     html5_files=""
     list=$(echo $files | tr " " "\n")
     for file in $list
     do
-      if [[ $file = bigbluebutton-html5* ]] ; then
+      if [[ $file = bigbluebutton-html5* ]] && [[ -e $file ]]
+      then
         html5_files+=" $file"
       fi
     done
 
-    cd ..
     bigbluebutton-html5/node_modules/.bin/eslint --ext .jsx,.js $html5_files
   elif [ $1 = acceptance_tests ]
   then