With reference to #561, display "[An anonymous user]" rather than an empty string for external requests with no external user name.
With reference to #561, display "[An anonymous user]" rather than an empty string for external requests with no external user name.

codeforcroatia/alaveteli,nzherald/alaveteli,nzherald/alaveteli,andreicristianpetcu/alaveteli,sarhane/alaveteli-test,obshtestvo/alaveteli-bulgaria,4bic/alaveteli,Br3nda/alaveteli,petterreinholdtsen/alaveteli,hasadna/alaveteli,nzherald/alaveteli,Br3nda/alaveteli,nzherald/alaveteli,TEDICpy/QueremoSaber,andreicristianpetcu/alaveteli_old,obshtestvo/alaveteli-bulgaria,obshtestvo/alaveteli-bulgaria,obshtestvo/alaveteli-bulgaria,hasadna/alaveteli,andreicristianpetcu/alaveteli,TEDICpy/QueremoSaber,andreicristianpetcu/alaveteli,hasadna/alaveteli,datauy/alaveteli,datauy/alaveteli,codeforcroatia/alaveteli,andreicristianpetcu/alaveteli_old,hasadna/alaveteli,nzherald/alaveteli,TEDICpy/QueremoSaber,hasadna/alaveteli,codeforcroatia/alaveteli,10layer/alaveteli,Br3nda/alaveteli,datauy/alaveteli,4bic/alaveteli,codeforcroatia/alaveteli,petterreinholdtsen/alaveteli,10layer/alaveteli,sarhane/alaveteli-test,4bic/alaveteli,andreicristianpetcu/alaveteli,Br3nda/alaveteli,10layer/alaveteli,TEDICpy/QueremoSaber,andreicristianpetcu/alaveteli_old,sarhane/alaveteli-test,Br3nda/alaveteli,petterreinholdtsen/alaveteli,andreicristianpetcu/alaveteli,sarhane/alaveteli-test,4bic/alaveteli,petterreinholdtsen/alaveteli,andreicristianpetcu/alaveteli_old,TEDICpy/QueremoSaber,obshtestvo/alaveteli-bulgaria,andreicristianpetcu/alaveteli_old,4bic/alaveteli,hasadna/alaveteli,petterreinholdtsen/alaveteli