Correction if div_mask is None

python/s2snow/fsc_config.py

@@ -350,7 +350,9 @@ class FscConfig:
 
             m_div_mask = mission_config.get("div_mask", None)
             if m_div_mask is not None:
-                self.div_mask = find_files(input_dir, m_div_mask)[0]
+                try:
+                    self.div_mask = find_files(input_dir, m_div_mask)[0]
+                except: pass
 
             m_dem = mission_config.get("dem", None)
             if m_dem is not None: