Fix print when we have violated constraints (#166)

Before, we could have errors happening right on the get_log method because some nodes might not have any sharding chosen. This PR changes instead to print the violated constraints, so that we can have a clear error message to users

Author: fmassa

autoparallel/optimize_sharding.py

@@ -655,7 +655,7 @@ def get_solution(self, verbose=False):
         self.res = [k for k, v in sol.items() if v == 1]
 
         if self.prob.status == -1:
-            print(self.get_log())
+            print(self.get_violated_constraints_log())
             raise RuntimeError("Unsolvable problem")
 
         opt = {}