Ensure yarn packages are installed when running only LintUI

build.sh

@@ -391,19 +391,18 @@ then
     fi
 fi
 
-if [ "$LINT" = "YES" ];
+if [[ "$LINT" = "YES" || "$FRONTEND" = "YES" ]];
 then
-    if [ -z "$FRONTEND" ];
+    YarnInstall
-    then
+fi
-        YarnInstall
-    fi
 
+if [ "$LINT" = "YES" ];
+then
     LintUI
 fi
 
 if [ "$FRONTEND" = "YES" ];
 then
-    YarnInstall
     RunWebpack
 fi