f add assertion the output is broadcastable

Author: TheBlueMatt

lightning/src/chain/package.rs

@@ -646,6 +646,7 @@ impl PackageTemplate {
 	{
 		debug_assert!(self.malleability == PackageMalleability::Malleable, "The package output is fixed for non-malleable packages");
 		let input_amounts = self.package_amount();
+		assert!(dust_limit_sats as i64 > 0, "Output script must be broadcastable/have a 'real' dust limit.");
 		// If old feerate is 0, first iteration of this claim, use normal fee calculation
 		if self.feerate_previous != 0 {
 			if let Some((new_fee, feerate)) = feerate_bump(predicted_weight, input_amounts, self.feerate_previous, fee_estimator, logger) {