Codechange: hide the map's size related fields in the Map structure

src/crashlog.cpp

@@ -413,9 +413,9 @@ bool CrashLog::WriteCrashLog(const char *buffer, char *filename, const char *fil
  */
 bool CrashLog::WriteSavegame(char *filename, const char *filename_last) const
 {
-	/* If the map array doesn't exist, saving will fail too. If the map got
+	/* If the map doesn't exist, saving will fail too. If the map got
 	 * initialised, there is a big chance the rest is initialised too. */
-	if (_m == nullptr) return false;
+	if (!Map::IsInitialized()) return false;
 
 	try {
 		GamelogEmergency();