Fix issues with added PanicException

src/Umbraco.Core/Exceptions/PanicException.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Runtime.Serialization;
+
+namespace Umbraco.Core.Exceptions
+{
+    /// <summary>
+    /// Represents an internal exception that in theory should never been thrown, it is only thrown in circumstances that should never happen.
+    /// </summary>
+    /// <seealso cref="System.Exception" />
+    [Serializable]
+    internal class PanicException : Exception
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PanicException" /> class.
+        /// </summary>
+        public PanicException()
+        { }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PanicException" /> class.
+        /// </summary>
+        /// <param name="message">The message that describes the error.</param>
+        public PanicException(string message)
+            : base(message)
+        { }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PanicException" /> class.
+        /// </summary>
+        /// <param name="message">The error message that explains the reason for the exception.</param>
+        /// <param name="innerException">The exception that is the cause of the current exception, or a null reference (<see langword="Nothing" /> in Visual Basic) if no inner exception is specified.</param>
+        public PanicException(string message, Exception innerException)
+            : base(message, innerException)
+        { }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PanicException" /> class.
+        /// </summary>
+        /// <param name="info">The <see cref="T:System.Runtime.Serialization.SerializationInfo" /> that holds the serialized object data about the exception being thrown.</param>
+        /// <param name="context">The <see cref="T:System.Runtime.Serialization.StreamingContext" /> that contains contextual information about the source or destination.</param>
+        protected PanicException(SerializationInfo info, StreamingContext context)
+            : base(info, context)
+        { }
+    }
+}