[LyX/master] Prevent division by zero

[Juergen Spitzmueller]

commit 0fc8ee5ace22c11175cb93f5b6f7310cc4d646c1
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sat Jun 15 14:48:37 2024 +0200

    Prevent division by zero
    
    Fixes crash reported at
    https://marc.info/?l=lyx-users&m=171842978728676
---
 src/insets/InsetTabular.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/insets/InsetTabular.cpp b/src/insets/InsetTabular.cpp
index 1f7cc33ba4..7fddfab7c3 100644
--- a/src/insets/InsetTabular.cpp
+++ b/src/insets/InsetTabular.cpp
@@ -1330,7 +1330,7 @@ bool Tabular::updateColumnWidths(MetricsInfo & mi)
 				changed = true;
 			}
 		}
-		if (changed && restwidth > 0)
+		if (changed && restwidth > 0 && restcols != 0)
 			vcolwidth = restwidth / restcols;
 	}