fixed issue where __call method sometimes returned an \money\money ob… #19

Job	Run time
Coding Standard & Static Analysis	12s
testsuite (7.4, sqlite)	23s
testsuite (7.4, mysql)	26s
testsuite (7.4, pgsql)	21s
testsuite (8.0, sqlite)	11s
testsuite (8.0, mysql)	31s
testsuite (8.0, pgsql)	17s
testsuite (8.1, sqlite)	17s
testsuite (8.1, mysql)	35s
testsuite (8.1, pgsql)	24s
testsuite (8.2, sqlite)	10s
testsuite (8.2, mysql)	30s
testsuite (8.2, pgsql)	24s
testsuite (8.3, sqlite)	17s
testsuite (8.3, mysql)	28s
testsuite (8.3, pgsql)	18s
	5m 44s

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