- do thinker profiling of internal dynlights only when they are present

There is no point to output zero calls and/or handle such case in profiling stats calculation

src/playsim/dthinker.cpp

@@ -150,6 +150,8 @@ void FThinkerCollection::RunThinkers(FLevelLocals *Level)
 			}
 		} while (count != 0);
 
+		if (Level->lights)
+		{
 			// Also profile the internal dynamic lights, even though they are not implemented as thinkers.
 			auto &prof = Profiles[NAME_InternalDynamicLight];
 			prof.timer.Clock();
@@ -161,6 +163,7 @@ void FThinkerCollection::RunThinkers(FLevelLocals *Level)
 				light = next;
 			}
 			prof.timer.Unclock();
+		}
 
 
 		struct SortedProfileInfo