bug #4499 Uncaught TypeError: Cannot call method 'substr' of undefined

Signed-off-by: Marc Delisle <marc@infomarc.info>
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Merge remote-tracking branch 'origin/QA_4_2' into QA_4_2
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bug #4498 PMA 4.2.x and HHVM

Signed-off-by: Marc Delisle <marc@infomarc.info>
ChangeLog entry

Signed-off-by: Marc Delisle <marc@infomarc.info>
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Merge remote-tracking branch 'origin/QA_4_2' into QA_4_2
bug #4500 mysql_doc_template is not defined

Signed-off-by: Marc Delisle <marc@infomarc.info>