fix: optional groups when using embedding against host projects

Author: NathanWalker

lib/pbxProject.js

@@ -2143,7 +2143,7 @@ function correctForFrameworksPath(file, project) {
 function correctForPath(file, project, group) {
     var r_group_dir = new RegExp('^' + group + '[\\\\/]');
 
-    if (project.pbxGroupByName(group).path)
+    if (project.pbxGroupByName(group)?.path)
         file.path = file.path.replace(r_group_dir, '');
 
     return file;
@@ -2393,7 +2393,7 @@ pbxProject.prototype.getPBXGroupByKey = function(key) {
 };
 
 pbxProject.prototype.getPBXVariantGroupByKey = function(key) {
-    return this.hash.project.objects['PBXVariantGroup'][key];
+    return this.hash.project.objects['PBXVariantGroup']?.[key];
 };