views: report clients without cache in fetch and restore

Report clients without cache partition inthe decks of the target
clients with enough cache to fit the target image.

ogcp/views.py

@@ -967,12 +967,17 @@ def image_fits_in_cache(server, clients_info, image):
             continue
 
         free_cache = client_info['free_cache']
+        used_cache = client_info['used_cache']
+        if used_cache == 0 and free_cache == 0:
+            err_report += f'{ip} has no cache partition<br>'
+            continue
+
         if free_cache < image_size:
             missing_cache = image_size - free_cache
             err_report += f'{ip} requires {(missing_cache / (1024 ** 3)):.3f} more free GiB<br>'
 
     if err_report:
-        flash(f'No space left on cache:<br>{err_report}', category='error')
+        flash(f'{err_report}', category='error')
         return False
 
     return True