Bug 1072180 - [GAIA][Contacts]if No Contacts on Gmail, while import sele...

...ct all and deselect all are enabled
nit: probably we can rename this to 'emptyAccount'. The problem is that currently we are using the term 'friends' in importations, and in order not to mix we can use that key. 

Wrt the string, for the reasons expressed above, I would change it to 'No friends or contacts found in this account'