Merge pull request #8347 from eileenmcnaughton/tidy-up

CRM-17335 reduce use of nullArray

diff --cc CRM/Admin/Form/PaymentProcessor.php
Simple merge

diff --cc CRM/Contact/BAO/Contact.php
Simple merge

diff --cc CRM/Contact/BAO/Contact/Utils.php
Simple merge

diff --cc CRM/Contact/Form/Task/PDFLetterCommon.php
Simple merge

diff --cc CRM/Contribute/BAO/Contribution.php
Simple merge

diff --cc CRM/Contribute/BAO/ContributionRecur.php
Simple merge

diff --cc CRM/Event/BAO/Participant.php
Simple merge

diff --cc CRM/Report/Form.php
Simple merge

diff --cc sql/GenerateReportData.php
Simple merge