Fixed, Map Analysis mode, Check Stuck Things: in some cases the check returned...

Fixed, Map Analysis mode, Check Stuck Things: in some cases the check returned false-negative results.

Source/Core/Config/ThingsFlagsCompare.cs

@@ -152,6 +152,9 @@ namespace CodeImp.DoomBuilder.Config
 						bool t1ignoreflagset = flaggrp.Value.invert ? !t1.Flags[flaggrp.Key] : t1.Flags[flaggrp.Key];
 						bool t2ignoreflagset = flaggrp.Value.invert ? !t2.Flags[flaggrp.Key] : t2.Flags[flaggrp.Key];
 
+						// Can be ignored?
+						if(!t1ignoreflagset && !t2ignoreflagset && flaggrp.Value.IgnoreGroupWhenUnset) continue;
+
 						// Can't compare...
 						if(!t1ignoreflagset || !t2ignoreflagset) return 0;
 					}	

Source/Plugins/BuilderModes/ErrorChecks/CheckStuckThings.cs

@@ -221,7 +221,7 @@ namespace CodeImp.DoomBuilder.BuilderModes
 		// Checks if the flags of two things overlap (i.e. if they show up at the same time)
 		private static bool FlagsOverlap(Thing t1, Thing t2) 
 		{
-			if (General.Map.Config.ThingFlagsCompare.Count < 1) return false; //mxd. Bail out if no settings...
+			if(General.Map.Config.ThingFlagsCompare.Count < 1) return true; //mxd. Otherwise, no things will ever overlap when ThingFlagsCompare is empty
 			int overlappinggroups = 0;
 
 			// Go through all flags in all groups and check if they overlap