Resutls: Read and display sediment results only if available.

src/Solver/Mage.py

@@ -677,8 +677,8 @@ class Mage8(Mage):
 
     @timer
     def read_gra(self, study, repertory, results, qlog = None):
-        # if not study.river.has_sediment():
-        #     return
+        if not study.river.has_sediment():
+            return
 
         logger.info(f"read_gra: Start ...")