Do not translate "" for good this time

src/extras/libc.c

@@ -189,6 +189,8 @@ int vlc_wclosedir( void *_p_dir )
 char *vlc_gettext( const char *msgid )
 {
 #ifdef ENABLE_NLS
+    if( unlikely(!*msgid))
+        return (char *)"";
     return dgettext( PACKAGE_NAME, msgid );
 #else
     return (char *)msgid;

src/modules/modules.c

@@ -301,6 +301,8 @@ const char *module_gettext (const module_t *m, const char *str)
 {
 #ifdef ENABLE_NLS
     const char *domain = m->domain ? m->domain : PACKAGE_NAME;
+    if (unlikely(!*str))
+        return "";
     return dgettext (domain, str);
 #else
     (void)m;