fixed lint issue. Moved validation of amount_msat to after the source…

… and the destination node validation

sim-lib/src/lib.rs

@@ -475,12 +475,6 @@ impl Simulation {
         }
 
         for payment_flow in self.activity.iter() {
-            // lets validate the amount_msats to be greater than zero
-            if payment_flow.amount_msat==0 {
-                return Err(LightningError::ValidationError(
-                    "Expected amount_msat should be greater than zero.".to_string(),
-                ));
-            }
             // We need every source node that is configured to execute some activity to be included in our set of
             // nodes so that we can execute events on it.
             self.nodes
@@ -498,6 +492,12 @@ impl Simulation {
                     payment_flow.destination,
                 )));
             }
+            // lets validate the amount_msats to be greater than zero
+            if payment_flow.amount_msat == 0 {
+                return Err(LightningError::ValidationError(
+                    "Expected amount_msat should be greater than zero.".to_string(),
+                ));
+            }
         }
 
         Ok(())