Fix coords clause

Signed-off-by: jolheiser <john.olheiser@gmail.com>

gui.py

@@ -1,5 +1,7 @@
 from datetime import datetime
 
+from django.db import connection
+
 from django_coreprotect.models import CoWorld, GUIResult
 from django_coreprotect.utils import safe_int, checkbox, time_to_form
 
@@ -110,6 +112,8 @@ def gui_results(form):
         coords.append(" y BETWEEN {0} - {1} AND {0} + {1}".format(form.y, radius))
     if form.z:
         coords.append(" z BETWEEN {0} - {1} AND {0} + {1}".format(form.z, radius))
+    coords_clause = ""
+    if coords:
         coords_clause = " AND ({})".format(" AND ".join(coords))
 
     players = []