fix import

bundles/plugins/org.bonitasoft.studio.common.repository/src/org/bonitasoft/studio/common/repository/operation/ImportBosArchiveOperation.java

@@ -220,7 +220,8 @@ public class ImportBosArchiveOperation {
                 return new HashSet<String>(Arrays.asList(array));
             }
         }
-        return Collections.emptySet();
+        //No manifest means import all .proc
+        return null;
     }
 
     protected void checkArchiveCompatibility(final IContainer container) {