only set initial first responder if it's non-nil
only set initial first responder if it's non-nil

cyclaero/cocotron,JackLian/cocotron,yuhangwang/cocotron,cjwl/cocotron,crystax/android-vendor-cocotron,gemu2015/cocotron-sierra,cyclaero/cocotron,plasq/cocotron,Suninus/cocotron,ruppmatt/cocotron,ruppmatt/cocotron,ruppmatt/cocotron,crystax/android-vendor-cocotron,crystax/android-vendor-cocotron,gemu2015/cocotron-sierra,cjwl/cocotron,cneira/cocotron,guestOS/guestOS,plasq/cocotron,Suninus/cocotron,gemu2015/cocotron-sierra,ruppmatt/cocotron,JackLian/cocotron,yuhangwang/cocotron,cyclaero/cocotron,plasq/cocotron,crystax/android-vendor-cocotron,guestOS/guestOS,cjwl/cocotron,gemu2015/cocotron-sierra,Suninus/cocotron,cneira/cocotron,cneira/cocotron,guestOS/guestOS,cjwl/cocotron,guestOS/guestOS,JackLian/cocotron,Suninus/cocotron,cyclaero/cocotron,yuhangwang/cocotron,cneira/cocotron,yuhangwang/cocotron,JackLian/cocotron,plasq/cocotron