get_item_list does not [item qty=0]

- By using `if not d.qty:` it totally limits the chance of creating an empty Delivery Note 
- Should be changed to `if d.qty is None` 

Use case for empty DN: 
- Open a Delivery Note and tight to a specific Sales Order first without knowing the real qty at this point.
- Using barcode scanner to receive Sales Order to this DN (multiple times).
[fix] Validate Expense Approver
minor fixes
Merge pull request #2150 from nabinhait/hotfix

minor fixes
Allow renaming for Sales Partner Doctype
Merge pull request #2149 from anandpdoshi/anand-september-5

[fix] Validate Expense Approver
Setup Wizard: set corrected number format in system settings
Merge pull request #2154 from anandpdoshi/anand-september-5

Setup Wizard: set corrected number format in system settings
Merge pull request #2151 from ankitjavalkarwork/fix1999

Allow renaming for Sales Partner Doctype
transations-08-sep-2014
Merge pull request #2158 from rmehta/translated

transations-08-sep-2014
[minor] Set in_list_view for Sales and Purchase item tables
Merge pull request #2159 from anandpdoshi/anand-september-8

[minor] Set in_list_view for Sales and Purchase item tables
Get items in PO from material requests based on supplier
Merge pull request #2140 from nathando/patch-1

get_item_list does not [item qty=0]
Merge pull request #2162 from nabinhait/hotfix

Get items in PO from material requests based on supplier
[fix] Clear website cache for Item Group on saving Item
[minor] Cheque Printing Format
Merge pull request #2165 from anandpdoshi/anand-september-9

Fix in web clear cache for Item, cheque printing format
change version in hooks.py