Fix nil pointer for replicated database engine

[rabenhorst]

There is a bug in the parseCreateDatabase which results in nil pointer when setting the engine for a replicated database, because it sets StatementEnd to onCluster.End() after checking if engineExpr is nil.

clickhouse-sql-parser/parser/parser_table.go

Lines 102 to 104 in c9e8bb4

	if engineExpr != nil {
	StatementEnd = onCluster.End()
	}

In this PR this is fixed and test case for replicated database is added.

[git-hulk]

@rabenhorst Good catch!

[coveralls]

Pull Request Test Coverage Report for Build 19428897560

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Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 50.935%

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Totals
Change from base Build 19351970609:	0.03%
Covered Lines:	7842
Relevant Lines:	15396

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💛 - Coveralls