Added checks to see if paste file exists.

Teknik/Areas/Paste/Controllers/PasteController.cs

@@ -106,6 +106,11 @@ namespace Teknik.Areas.Paste.Controllers
                 // Read in the file
                 string subDir = paste.FileName[0].ToString();
                 string filePath = Path.Combine(_config.PasteConfig.PasteDirectory, subDir, paste.FileName);
+                if (!System.IO.File.Exists(filePath))
+                {
+                    return new StatusCodeResult(StatusCodes.Status404NotFound);
+                }
+
                 using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
                 using (AesCounterStream cs = new AesCounterStream(fs, false, keyBytes, ivBytes))
                 using (StreamReader sr = new StreamReader(cs, Encoding.Unicode))

Teknik/Areas/Vault/Controllers/VaultController.cs

@@ -110,6 +110,9 @@ namespace Teknik.Areas.Vault.Controllers
                                 // Read in the file
                                 string subDir = paste.Paste.FileName[0].ToString();
                                 string filePath = Path.Combine(_config.PasteConfig.PasteDirectory, subDir, paste.Paste.FileName);
+                                if (!System.IO.File.Exists(filePath))
+                                    continue;
+
                                 byte[] ivBytes = Encoding.Unicode.GetBytes(paste.Paste.IV);
                                 byte[] keyBytes = AesCounterManaged.CreateKey(paste.Paste.Key, ivBytes, paste.Paste.KeySize);
                                 using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))