TYPO3 Core

As the extension itself has not changed since I successfully loaded it into 4.0 RC1, and as I did not run into this error in RC1, I am reporting this for the Extension Manager.

Importing skin_grey_2 version 0.0.1 (according to http://typo3.org/extensions/repository/search/skin_grey_2/0.0.1/details/ that is created 25.03.2006 - 18:47) from TER into 4.0 RC2 gives me

Warning: Invalid argument supplied for foreach() in [...]/typo3_src-4.0rc2/typo3/mod/tools/em/class.em_index.php on line 3956

Next, installing it yields the same error. It seems that the end result is fine though (the skin looks good). Even uninstalling gives the same error.

I uninstalled and removed the extension, cleared temp_CACHED files in typo3conf and imported and installed again -- with the same error.

The error occurs in:

3950 function checkDependencies($extKey, $conf, $instExtInfo) {
:
3956 foreach($conf['constraints']['depends'] as $depK => $depV) {

It might very well only apply to extensions that have no dependencies, as the generated ext_emconf.php for skin_grey_2 shows (partially copied)

'title' => 'Gray/orange skin for TYPO3 4.0',
    'constraints' => array(
        '' => array(
            '' => '',
        ),
    ),

The "constraints" item looks different from, for example, t3skin:

'title' => 'TYPO3 skin',
    'constraints' => array(
        'depends' => array(
            'php' => '4.3.0-5.9.0',
            'typo3' => '3.9.0-4.0',
        ),
        'conflicts' => array(
        ),
        'suggests' => array(
        ),
    ),

Likewise, tipafriend (which has no depencies either) shows:

'title' => 'Tip-A-Friend',
    'constraints' => array(
        'depends' => array(
        ),
        'conflicts' => array(
        ),
        'suggests' => array(
        ),
    ),

So maybe the extension is wrong, but again: I did not get this error in 4.0 RC1 and maybe more (erroneous) extensions will now suddenly show the same error. To avoid this, an additional check for a value for

$conf['constraints']['depends']

might avoid existing extensions from breaking?

(issue imported from #M3033)