review fixes

Author: Stepan Neretin

pg_probackup2/app.py

@@ -571,7 +571,7 @@ def show(
                         backup_list.append(backup)
 
             if backup_id is not None:
-                assert False, "Failed to find backup with ID: {0}".format(backup_id)
+                raise RuntimeError("Failed to find backup with ID: {0}".format(backup_id))
 
             return backup_list
         else:
@@ -629,7 +629,7 @@ def show(
                     specific_record[name.strip()] = var
 
                 if not specific_record:
-                    assert False, "Failed to find backup with ID: {0}".format(backup_id)
+                    raise RuntimeError("Failed to find backup with ID: {0}".format(backup_id))
 
                 return specific_record
 
@@ -782,8 +782,8 @@ def set_archiving(
         instances_json = self.show(instance=None, as_json=True, expect_error=False, as_text=True)
         instances_data = json.loads(instances_json)
         if not any(inst_data.get('instance') == instance for inst_data in instances_data):
-            assert False, "Instance '{0}' does not exist. " \
-                          "Please add the instance first using add_instance() or init_pb_node().".format(instance)
+            raise RuntimeError("Instance '{0}' does not exist. " \
+                          "Please add the instance first using add_instance() or init_pb_node().".format(instance))
 
         # parse postgresql.auto.conf
         options = {}