Use method_exists instead

* try catch does not work in this case, using function_exists instead.
9 jobs for 20-move-api-path-to-password-php in 3 minutes and 32 seconds (queued for 1 minute and 11 seconds)
Status Job ID Name Coverage
  Lint
passed #5954
lint:lint-php5.4

00:00:49

passed #5955
lint:lint-php5.6

00:00:50

passed #5956
lint:lint-php7.0

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passed #5957
lint:lint-php7.1

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  Codesniffer
passed #5958
codesniffer

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  Unit
passed #5959
unit:testBasic

00:00:57

passed #5960
unit:testRead

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passed #5961
unit:testReadAssertFail

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passed #5962
unit:testUserProperty

00:00:54