#1303398 by johnv: Some entities might have a certain field value just empty but it's set, which caused notices

#1307162 by cmurph: Check whether an argument is empty or not when loading the taxonomy term for the title

#1291658 by jackalope: Convert views_plugin_argument_default_taxonomy_tid to new return value of views_get_page_view

#1251052 by dereine: Add automatic conversions of joins to relationships for users_roles and role. Additional clean up comment/node author relationship

#1270982 by drunken monkey, dereine: Allow to specify entity type on non-base-tables, which allows some fancy views integrations like a generic entity views integration

#1272350 by tunic: Fix content translation filter function, which still used the old add_where instead of add_where_expression

#1261468 by dereine: Fix notices when relationship label is not defined and strict error on views_handler_field_accesslog_path

Currently the comment row assumes somehow that there are
only comments displayed from one node, so it uses just a single node_load per row.
Changed this to load all used nodes in the pre_render so it saves all this heavy loading.