[Rendering] Fixes to Thumbnail Cache;

Author: LittleCodingFox

Engine/Staple.Editor/ThumbnailCache.cs

@@ -248,12 +248,13 @@ void Cleanup()
                         renderTarget.GetColorTexture(0).ReadPixels((texture, data) =>
                         {
                             tempEntity.Destroy();
-                            renderTarget.Destroy();
 
                             if (texture == null || data == null)
                             {
                                 Cleanup();
 
+                                renderTarget.Destroy();
+
                                 return;
                             }
 
@@ -265,6 +266,8 @@ void Cleanup()
                                 data = data,
                             };
 
+                            renderTarget.Destroy();
+
                             try
                             {
                                 var pngData = rawTextureData.EncodePNG();
@@ -443,6 +446,8 @@ void Cleanup()
                         {
                             Cleanup();
 
+                            renderTarget.Destroy();
+
                             return;
                         }
 
@@ -503,10 +508,11 @@ void Cleanup()
                         renderTarget.GetColorTexture(0).ReadPixels((texture, data) =>
                         {
                             tempEntity.Destroy();
-                            renderTarget.Destroy();
 
                             if (texture == null || data == null)
                             {
+                                renderTarget.Destroy();
+
                                 Cleanup();
 
                                 return;
@@ -520,6 +526,8 @@ void Cleanup()
                                 data = data,
                             };
 
+                            renderTarget.Destroy();
+
                             try
                             {
                                 var pngData = rawTextureData.EncodePNG();