[LyX/master] Error message

[Richard Kimberly Heck]

commit a41bcb3701ad0026054a7ce5e95ca090dc6132d6
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Mon Sep 28 22:45:44 2020 -0400

    Error message
---
 src/Layout.cpp |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/src/Layout.cpp b/src/Layout.cpp
index f3dfa4a..01c4f16 100644
--- a/src/Layout.cpp
+++ b/src/Layout.cpp
@@ -1151,8 +1151,10 @@ void Layout::readSpacing(Lexer & lex)
 
 void Layout::readArgument(Lexer & lex, bool validating)
 {
-	if (!lex.next())
+	if (!lex.next()) {
+		LYXERR0("Unable to read argument ID!");
 		return;
+	}
 	string const id = lex.getString();
 
 	bool const itemarg = prefixIs(id, "item:");