app.vendor_projects is defined in config.rb, not xcode_config.rb

lib/motion/project/config.rb

@@ -82,6 +82,7 @@ module Motion; module Project
       @version = '1.0'
       @detect_dependencies = true
       @exclude_from_detect_dependencies = []
+      @vendor_projects = []
     end
 
     OSX_VERSION = `/usr/bin/sw_vers -productVersion`.strip.sub(/\.\d+$/, '').to_f

lib/motion/project/xcode_config.rb

@@ -37,7 +37,6 @@ module Motion; module Project;
       @libs = []
       @bundle_signature = '????'
       @short_version = nil
-      @vendor_projects = []
       @entitlements = {}
       @delegate_class = 'AppDelegate'
       @spec_mode = false