Issue #301 fix, check for nil before adding to _allObjects in NSNib.m
Issue #301 fix, check for nil before adding to _allObjects in NSNib.m

mpw/marcelweiher-libobjc2,mpw/marcelweiher-libobjc2,berkus/cocotron,uptime-services/development-arts,berkus/cocotron,uptime-services/development-arts,liruqi/cocotron,uptime-services/development-arts,berkus/cocotron,mpw/marcelweiher-libobjc2,liruqi/cocotron,uptime-services/development-arts,berkus/cocotron,liruqi/cocotron,liruqi/cocotron,mpw/marcelweiher-libobjc2