Ignore empty strings that represent a number.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@9814 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/openfire/muc/spi/IQMUCSearchHandler.java

@@ -176,13 +176,19 @@ public class IQMUCSearchHandler
 			final FormField userAmountFF = df.getField("num_users");
 			if (userAmountFF != null)
 			{
-				numusers = Integer.parseInt(getFirstValue(userAmountFF));
+                String value = getFirstValue(userAmountFF);
+                if (value != null && !"".equals(value)) {
+                    numusers = Integer.parseInt(value);
+                }
 			}
 
 			final FormField maxUsersFF = df.getField("num_max_users");
 			if (maxUsersFF != null)
 			{
-				numaxusers = Integer.parseInt(getFirstValue(maxUsersFF));
+                String value = getFirstValue(maxUsersFF);
+                if (value != null && !"".equals(value)) {
+                    numaxusers = Integer.parseInt(value);
+                }
             }
 		}
 		catch (NumberFormatException e)