Fix Server triggering wrong errors if environment init fails

src/serverenvironment.h

@@ -440,6 +440,8 @@ private:
 	IntervalLimiter m_active_blocks_management_interval;
 	IntervalLimiter m_active_block_modifier_interval;
 	IntervalLimiter m_active_blocks_nodemetadata_interval;
+	// Whether the variables below have been read from file yet
+	bool m_meta_loaded = false;
 	// Time from the beginning of the game in seconds.
 	// Incremented in step().
 	u32 m_game_time = 0;