Fix empty lines bug

When RawLines only has 1 point it can't make a line...

Author: STREGA

Sources/GateEngine/Resources/Geometry/Lines.swift

@@ -118,7 +118,7 @@ extension ResourceManager {
         let key = Cache.GeometryKey(requestedPath: path, kind: .lines, geometryOptions: .none)
         if cache.geometries[key] == nil {
             cache.geometries[key] = Cache.GeometryCache()
-            if let lines = lines {
+            if let lines = lines, lines.isEmpty == false {
                 Game.unsafeShared.resourceManager.incrementLoading(path: key.requestedPath)
 
                 if let cache = self.cache.geometries[key] {

Sources/GateEngine/Resources/Geometry/Raw/RawLines.swift

@@ -12,7 +12,8 @@ public struct RawLines: Sendable {
     var indices: [UInt16]
 
     public var isEmpty: Bool {
-        return indices.isEmpty
+        // If at least 2 points exists, then we have 1 line and are not empty
+        return indices.count < 2
     }
 
     public init() {