Fix LuaAddonFileInfo returning NULL content.

src/addoncreator/Addon/AddonFileInfo.cs

@@ -1,3 +1,4 @@
+using System.Diagnostics;
 using GarrysMod.AddonCreator.Hashing;
 
 namespace GarrysMod.AddonCreator.Addon
@@ -8,23 +9,47 @@ namespace GarrysMod.AddonCreator.Addon
         private long? _size;
 
         /// <summary>
-        /// The file size.
+        ///     The file size.
         /// </summary>
         public virtual long Size
         {
-            get { lock(this) return _size.HasValue ? _size.Value : (_size = GetContents().Length).Value; }
+            get
+            {
+                lock (this)
+                {
+                    if (_size != null)
+                        return _size.Value;
+
+                    var contents = GetContents();
+                    Debug.Assert(contents != null, "Contents are NULL");
+
+                    return (_size = contents.Length).Value;
+                }
+            }
         }
 
         /// <summary>
-        /// The CRC32 hash of this file.
+        ///     The CRC32 hash of this file.
         /// </summary>
         public virtual int Crc32Hash
         {
-            get { lock (this) return _hash.HasValue ? _hash.Value : (_hash = Crc32.Compute(GetContents())).Value; }
+            get
+            {
+                lock (this)
+                {
+                    if (_hash != null)
+                        return _hash.Value;
+
+                    var contents = GetContents();
+                    Debug.Assert(contents != null, "Contents are NULL");
+
+                    return (_hash = Crc32.Compute(GetContents())).Value;
+                }
+            }
         }
 
         /// <summary>
-        /// Reads all contents of this file and returns it as a byte array.
+        ///     Reads all contents of this file and returns it as a byte array.
         /// </summary>
         /// <returns>Byte array of the file content</returns>
         public abstract byte[] GetContents();

src/addoncreator/Addon/LuaAddonFileInfo.cs

@@ -42,6 +42,7 @@ namespace GarrysMod.AddonCreator.Addon
             _luaCode = Encoding.UTF8.GetString(_fi.GetContents());
             _luaCode = Regex.Replace(_luaCode, _stripCommentsRegex, m => m.Groups["linebreak"] != null ? m.Groups["linebreak"].Value : "");
 
+            _content = Encoding.UTF8.GetBytes(_luaCode);
 
             return _content;
         }