File mono-fix-image-writer.diff of Package mono

--- mono-4.4.2/mono/mini/image-writer.c.orig	2017-06-07 12:51:07.210345286 +0200
+++ mono-4.4.2/mono/mini/image-writer.c	2017-06-07 12:54:10.526378446 +0200
@@ -348,7 +348,7 @@
 static void
 bin_writer_emit_string (MonoImageWriter *acfg, const char *value)
 {
-	int size = strlen (value) + 1;
+	int size = value == NULL ? 0 : (strlen (value) + 1);
 	bin_writer_emit_bytes (acfg, (const guint8*)value, size);
 }