Fix to BLF_pgettext, which was returning "" when passed NULL msgid... Never noticed any problem, but it looks it could produce strange UI issues (like deactivated buttons), and it was not consistent anyway!

Thanks to S. Lockal for spotting the issue and providing a patch.

source/blender/blenfont/intern/blf_translation.c

@@ -90,9 +90,9 @@ void BLF_free_unifont(void)
 const char *BLF_pgettext(const char *msgctxt, const char *msgid)
 {
 #ifdef WITH_INTERNATIONAL
-	if (msgid && msgid[0]) {
-		const char *ret;
+	const char *ret = msgid;
 
+	if (msgid && msgid[0]) {
 		/*if (msgctxt && !strcmp(msgctxt, BLF_I18NCONTEXT_DEFAULT_BPY_INTERN)) { */
 		if (msgctxt && msgctxt[0] == BLF_I18NCONTEXT_DEFAULT_BPY[0]) {
 			/* BLF_I18NCONTEXT_DEFAULT_BPY context is reserved and considered the same as default NULL one. */
@@ -105,10 +105,9 @@ const char *BLF_pgettext(const char *msgctxt, const char *msgid)
 		if (ret == msgid) {
 			ret = BPY_app_translations_py_pgettext(msgctxt, msgid);
 		}
-
-		return ret;
 	}
-	return "";
+
+	return ret;
 #else
 	(void)msgctxt;
 	return msgid;