Fix T68868: Assert in depsgraph debugging logs

Was happening when tagging for LEGACY_0 was used.

1 files changed, 6 insertions, 3 deletions

diff --git a/source/blender/depsgraph/intern/depsgraph_tag.cc b/source/blender/depsgraph/intern/depsgraph_tag.cc
index b73a3c08e10..72ef495f1d5 100644
--- a/source/blender/depsgraph/intern/depsgraph_tag.cc
+++ b/source/blender/depsgraph/intern/depsgraph_tag.cc
@@ -412,11 +412,15 @@ static void graph_id_tag_update_single_flag(Main *bmain,
 
 string stringify_append_bit(const string &str, IDRecalcFlag tag)
 {
+  const char *tag_name = DEG_update_tag_as_string(tag);
+  if (tag_name == NULL) {
+    return str;
+  }
   string result = str;
   if (!result.empty()) {
     result += ", ";
   }
-  result += DEG_update_tag_as_string(tag);
+  result += tag_name;
   return result;
 }
 
@@ -717,8 +721,7 @@ const char *DEG_update_tag_as_string(IDRecalcFlag flag)
     case ID_RECALC_ALL:
       return "ALL";
   }
-  BLI_assert(!"Unhandled update flag, should never happen!");
-  return "UNKNOWN";
+  return NULL;
 }
 
 /* Data-Based Tagging  */