Handle fallback if Xcode is not installed

If Xcode is not installed the
active_path = /Library/Developer/CommandLineTools
Thus if the active_path does not contain the word Xcode, we will fall
back to opening the project file with the Finder's recommended program

plugins/xcode/xcode.plugin.zsh

@@ -15,8 +15,13 @@ function xc {
   else
     echo "Found ${xcode_proj[1]}"
     active_path=$(xcode-select -p)
+    if [[ ${active_path} =~ "Xcode" ]]; then
         active_path=${active_path%%/Contents/Developer*}
+        echo "Opening with ${active_path}"
         open -a "${active_path}" "${xcode_proj[1]}"
+    else # No Xcode installed
+        open "${xcode_proj[1]}" # Fall back to using Finder suggested application
+    fi
   fi
 }