Catch UnsupportedOperationException

Author: laeubi

org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/embedder/MavenProjectMutableState.java

@@ -78,9 +78,14 @@ public void restore(MavenProject project) {
   }
 
   private <T> void setElements(List<T> collection, List<T> elements) {
-    if(elements != null) {
-      collection.clear();
-      collection.addAll(elements);
+    try {
+      if(elements != null) {
+        collection.clear();
+        collection.addAll(elements);
+      }
+    } catch(UnsupportedOperationException e) {
+      System.err.println("Can't set elements as requested: ");
+      e.printStackTrace();
     }
   }