Possibly fix this bug:

To reproduce:
1) Press Cntl-N (start new file)
2) Press Alt-I, I, B (insert TOC from BibTeX)
3) Press Alt-A (Add...)
4) Double Click test
5) Press Alt-O (OK)
6) Press Alt-I C (Insert Citation)
7) Press Alt-A (Add) 

* familyName(): return earlier if author name is empty.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18987 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/controllers/frontend_helpers.cpp

@@ -176,6 +176,9 @@ string const asValidLatexCommand(string const & input,
 
 docstring const familyName(docstring const & name)
 {
+	if (name.empty())
+		return docstring();
+
 	// Very simple parser
 	docstring fname = name;