[evolution-data-server] Bug 749773 - [IMAPx] Ignore preceding '+' in capability name

[Milan Crha <mcrha src gnome org>]

commit 476b2f1726fd7b8076b9014d3a31f827e3b6a7cf
Author: Milan Crha <mcrha redhat com>
Date:   Thu Aug 27 19:29:39 2015 +0200

    Bug 749773 - [IMAPx] Ignore preceding '+' in capability name

 camel/providers/imapx/camel-imapx-utils.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/camel/providers/imapx/camel-imapx-utils.c b/camel/providers/imapx/camel-imapx-utils.c
index da51e65..574463e 100644
--- a/camel/providers/imapx/camel-imapx-utils.c
+++ b/camel/providers/imapx/camel-imapx-utils.c
@@ -521,6 +521,9 @@ imapx_parse_capability (CamelIMAPXInputStream *stream,
                                        stream, tok, token, len);
                                break;
                        case 43:
+                               /* the CAPABILITY shouldn't start with a '+', ignore it then */
+                               if (!token)
+                                       break;
                                token = (guchar *) g_strconcat ((gchar *) token, "+", NULL);
                                free_token = TRUE;
                                /* coverity[fallthrough] */