Fix #4164: Keep on crashing on OpenRCT2 0.0.5

Caused by 	hrow; instead of 	hrow Exception() when the image table is too large.

src/core/Exception.hpp

@@ -24,7 +24,7 @@
 class Exception : public std::exception
 {
 public:
-    Exception() : Exception(nullptr) { }
+    Exception() : Exception("") { }
 
     Exception(const char * message) : Exception(std::string(message)) { }
 

src/object/ImageTable.cpp

@@ -47,7 +47,7 @@ void ImageTable::Read(IReadObjectContext * context, IStream * stream)
         if (_data == nullptr)
         {
             context->LogError(OBJECT_ERROR_BAD_IMAGE_TABLE, "Image table too large.");
-            throw;
+            throw Exception();
         }
 
         // Read g1 element headers