[TYPO3-core] RFC #13506: Bug: Function changePassword does not work, when hitting 'enter' in change password form

[Christian Futterlieb]

Hi,

This is an SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=13506

Branches:
TYPO3_4-3 & TYPO3_4-2 & trunk

Problem:
When no value="" attribute is specified for the submit button of the 
change password form (e.g. <input type="image" src="submit.png" 
alt="###SEND_PASSWORD###" name="tx_felogin_pi1[changepasswordsubmit]" 
/>), its _POST value will be '0', when the form was sent by hitting 
'ENTER' instead of mouse-clicking the button.

The method tx_felogin_pi1->changePassword() checks the _POST value only 
with if() and the request will be ignored in above case.

Solution:
Check the passed value with isset(),

Notes:
I'm not sure about which branch(es) to suggest. The check in 
changePassword() is the same since it's introduction 
(http://bugs.typo3.org/view.php?id=10017)

Regards
Christian Futterlieb
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