Fix deprecated message for strlen first value null

[leissbua]

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Fixed Issues (if relevant)

1. Fixes OpenMage/magento-lts#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

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[ADDISON74]

@leissbua - How did you reproduce the error that led to the proposed change?

[leissbua]

@ADDISON74 we experienced deprecation warnings, that first parameter passed to can not be null. From my pov as null can no longer be passed this has to be fixed in general for all strpos strlen and so on.

[sreichel]

Steps to reproduce would be nice.

null seems to be a possible return type ...

    public function getDefaultValue()
    {
        return $this->_getData('default_value');
    }