do not show people as project members when they have no roles

People were being temporarily shown in the project list with no roles when
they should have been completely removed. It was just a caching issue with
the people sorting object.

zanata-war/src/main/java/org/zanata/action/ProjectHomeAction.java

@@ -791,6 +791,11 @@ public void savePermissionDialogSelections() {
         personRoles = null;
         personLocaleRoles = null;
         project = null;
+
+        // Person may have no roles left and no longer belong in the list, so
+        // ensure the list of people is refreshed.
+        peopleFilterComparator.clearAllMembers();
+        peopleFilterComparator.sortPeopleList();
     }
 
 
@@ -838,6 +843,10 @@ protected List<HPerson> fetchAll() {
             return allMembers;
         }
 
+        public void clearAllMembers() {
+            allMembers = null;
+        }
+
         @Override
         protected boolean include(HPerson person, final String filter) {
             if(StringUtils.isBlank(filter)) {