[LyX/master] Fix bug #9296. The key may be multiple keys.

[Richard Heck]

commit 080a4d84e295db1f2c2589af46fcfa981a716406
Author: Richard Heck <rgh...@lyx.org>
Date:   Tue Oct 14 15:41:42 2014 -0400

    Fix bug #9296. The key may be multiple keys.

diff --git a/src/BiblioInfo.cpp b/src/BiblioInfo.cpp
index 9a93ed4..7012779 100644
--- a/src/BiblioInfo.cpp
+++ b/src/BiblioInfo.cpp
@@ -942,7 +942,9 @@ docstring const BiblioInfo::getLabel(vector<docstring> keys,
 
 bool BiblioInfo::isBibtex(docstring const & key) const
 {
-       BiblioInfo::const_iterator it = find(key);
+       docstring key1;
+       split(key, key1, ',');
+       BiblioInfo::const_iterator it = find(key1);
        if (it == end())
                return false;
        return it->second.isBibTeX();