Check if $module is an object

Fixing the
> Creating default object from empty value in /.../libraries/cms/module/helper.php on line 163

warning if `JModuleHelper::renderModule` is called without a proper module object.
Adding checks for properties and logging the error.
Update warnings.php

Extension Manager should not display a warning about PHP memory limit if memory_limit is set to -1
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33230
Update default.php

Very tiny change to hide "Print"-button in prints
Fix "Error displaying the error page: Application Instantiation Error" Error
fix for Notice: Undefined variable: nowDate

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33248&start=8425
Merge pull request #3084 from vdespa/patch-2

fix for Notice: Undefined variable: nowDate
Merge pull request #3074 from elkuku/error-on-db-failure

Fix "Error displaying the error page: Application Instantiation Error" Error [#33251]
Merge pull request #3056 from Bakual/FixRenderModule

Check if $module is an object in JModuleHelper::renderModule()
Error in featured view article dropdown
[#32730] Change in libraries/joomla/form/fields/calendar.php causing
wrong date format  (Fix #2531)
Merge pull request #3059 from toivo/patch-2

Update warnings.php
Merge pull request #3062 from eino-makitalo/staging

Update default.php
Merge pull request #3094 from infograf768/featured_dropdown

Error in featured view article dropdown
Jenkins wasn't happy with CodeStyle
Removing and adding some whitespaces