Make it possible to get exceptions in async mode.

src/XMPPConnection.h

@@ -116,6 +116,18 @@
  */
 - (void)connectionWasClosed: (XMPPConnection*)connection;
 
+/**
+ * \brief This callback is called when the connection threw an exception.
+ *
+ * This is only called for connections on which \ref handleConnection: has been
+ * called.
+ *
+ * \param connection The connection which threw an exception
+ * \param exception The exception the connection threw
+ */
+-  (void)connection: (XMPPConnection*)connection
+  didThrowException: (OFException*)exception;
+
 /**
  * \brief This callback is called when the connection is about to upgrade to
  *	  TLS.

src/XMPPConnection.m

@@ -344,13 +344,26 @@
 	  exception: (OFException*)exception
 {
 	if (exception != nil) {
+		[delegates broadcastSelector: @selector(connection:
+						  didThrowException::)
+				  withObject: self
+				  withObject: exception];
 		[self close];
 		return NO;
 	}
 
-	if (![self XMPP_parseBuffer: buffer
+	@try {
-			     length: length])
+		if (![self XMPP_parseBuffer: buffer
+				     length: length])
+			return NO;
+	} @catch (id e) {
+		[delegates broadcastSelector: @selector(connection:
+						  didThrowException::)
+				  withObject: self
+				  withObject: e];
+		[self close];
 		return NO;
+	}
 
 	if (oldParser != nil || oldElementBuilder != nil) {
 		[oldParser release];