Allow completely empty subjects when moderating Mailman lists

Some list servers seem to make it completely blank whereas some put
"(No subject)". With this change, both are supported.

Per report from Dave Paul

src/net/hagander/mailinglistmoderator/backend/providers/Mailman.java

@@ -14,6 +14,7 @@
 import net.hagander.mailinglistmoderator.backend.ListServer;
 import net.hagander.mailinglistmoderator.backend.MailMessage;
 import net.hagander.mailinglistmoderator.backend.MailMessage.statuslevel;
+import android.util.Log;
 
 /**
  * 
@@ -34,7 +35,7 @@ public Mailman(String name, String rooturl, String password) {
 					Pattern.DOTALL);
 	private static final Pattern messageContentPattern = Pattern
 			.compile(
-					"<td ALIGN=\"right\"><strong>From:</strong></td>\\s+<td>([^<]+)</td>.*?<td ALIGN=\"right\"><strong>Subject:</strong></td>\\s+<td>([^<]+)</td>.*?<td><TEXTAREA NAME=fulltext-(\\d+) ROWS=10 COLS=76 WRAP=soft READONLY>([^<]+)</TEXTAREA></td>",
+					"<td ALIGN=\"right\"><strong>From:</strong></td>\\s+<td>([^<]+)</td>.*?<td ALIGN=\"right\"><strong>Subject:</strong></td>\\s+<td>([^<]*)</td>.*?<td><TEXTAREA NAME=fulltext-(\\d+) ROWS=10 COLS=76 WRAP=soft READONLY>([^<]+)</TEXTAREA></td>",
 					Pattern.DOTALL);
 	private static final Pattern authorizationFailedPattern = Pattern
 			.compile(