Remove redundant placeholder world definition.

Co-Authored-By: Gustas Kažukauskas <37534529+punkpun@users.noreply.github.com>

OpenRA.Game/Primitives/ActorInfoDictionary.cs

@@ -24,6 +24,15 @@ namespace OpenRA
 			ArgumentNullException.ThrowIfNull(dict);
 
 			this.dict = new Dictionary<string, ActorInfo>(dict);
+
+			// Include an empty entry for each system actor to guarantee that
+			// they will be defined even if not specified in the mod yaml
+			foreach (var systemActor in Enum.GetValues<SystemActors>())
+			{
+				var key = systemActor.ToString().ToLowerInvariant();
+				if (!dict.ContainsKey(key))
+					this.dict[key] = new ActorInfo(key);
+			}
 		}
 
 		public bool ContainsKey(string key) => dict.ContainsKey(key);

mods/cnc-content/mod.yaml

@@ -11,7 +11,6 @@ FileSystem: DefaultFileSystem
 		$cnc-content: cnccontent
 
 Rules:
-	content|rules.yaml
 
 Cursors:
 	content|cursors.yaml

mods/common-content/rules.yaml

@@ -1 +0,0 @@
-World:

mods/d2k-content/mod.yaml

@@ -11,7 +11,6 @@ FileSystem: DefaultFileSystem
 		$d2k-content: d2kcontent
 
 Rules:
-	content|rules.yaml
 
 Cursors:
 	content|cursors.yaml

mods/ra-content/mod.yaml

@@ -11,7 +11,6 @@ FileSystem: DefaultFileSystem
 		$ra-content: racontent
 
 Rules:
-	content|rules.yaml
 
 Cursors:
 	content|cursors.yaml

mods/ts-content/mod.yaml

@@ -11,7 +11,6 @@ FileSystem: DefaultFileSystem
 		$ts-content: tscontent
 
 Rules:
-	content|rules.yaml
 
 Cursors:
 	content|cursors.yaml