[LyX/master] Avoid empty option in babelCall

[Juergen Spitzmueller]

commit 66aa0d86994f173a0be18478d75c74a37ffcf815
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sun Aug 25 13:23:57 2024 +0200

    Avoid empty option in babelCall
---
 src/BufferParams.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/BufferParams.cpp b/src/BufferParams.cpp
index e8f302537c..5930aaf7b9 100644
--- a/src/BufferParams.cpp
+++ b/src/BufferParams.cpp
@@ -3539,7 +3539,7 @@ string BufferParams::babelCall(LaTeXFeatures const & features, string lang_opts,
 		lang_opts = getStringFromVector(blangs);
 	// The prefs may require the languages to
 	// be submitted to babel itself (not the class).
-	if (langoptions || have_mods)
+	if ((langoptions || have_mods) && !lang_opts.empty())
 		return "\\usepackage[" + lang_opts + "]{babel}" + os.str();
 	return "\\usepackage{babel}" + os.str();
 }