Fix #689 NPE from entity hider mixin.

runelite-mixins/src/main/java/net/runelite/mixins/EntityHiderMixin.java

@@ -165,12 +165,18 @@ public abstract class EntityHiderMixin implements RSScene
 			}
 
 			for (String name : names)
+			{
+				if (name != null && !name.equals(""))
+				{
+					if (npc.getName() != null)
 					{
 						if (npc.getName().startsWith(name))
 						{
 							return false;
 						}
 					}
+				}
+			}
 
 			return drawingUI ? !hideNPCs2D : !hideNPCs;
 		}