speed-up for region sampling by avoiding a repeated check

ultranest/integrator.py

@@ -1655,6 +1655,10 @@ def _create_point(self, Lmin, ndraw, active_u, active_values):
             loglikelihoods of current live points
 
         """
+        assert self.region.inside(active_u).any(), \
+            ("None of the live points satisfies the current region!",
+             self.region.maxradiussq, self.region.u, self.region.unormed, active_u)
+
         nit = 0
         while True:
             ib = self.ib
@@ -1681,10 +1685,6 @@ def _create_point(self, Lmin, ndraw, active_u, active_values):
                 # skip if we already know it is not useful
                 ib = 0 if np.isfinite(self.likes[0]) else 1
 
-            assert self.region.inside(active_u).any(), \
-                ("None of the live points satisfies the current region!",
-                 self.region.maxradiussq, self.region.u, self.region.unormed, active_u)
-
             use_stepsampler = self.stepsampler is not None
             while ib >= len(self.samples):
                 ib = 0