I wouldn't be so sure. My account is purely anecdote but beggars in Paris do not seem to be distinctly North African (as far as you can assess those things). The only group featuring prominently is what most would identify as "Roma" (Gipsy, Tzigan, etc...) EDIT : And people claiming to be Syrians lately. However, according to the French Statistical Office, you're certainly more likely to be homeless if you're an immigrant (half of the adults counted as homeless were foreign. On top of that, asylum seekers are considered as such when housed in a transit public center).
Out of curiosity I checked and the most common nationalities for asylum seekers in France currently (2015, 2016) are : Sudan, Syria, Kosovo, Albania, China, Bangladesh, Haitï, Congo (Democratic Republic), Guinea, Afghanistan, Bangladesh, Irak. Algeria was 9th in 2016.