remove break after input in pipeline

kyaml/kio/kio.go

@@ -75,11 +75,6 @@ type Pipeline struct {
 
 	// Outputs are where the transformed Resource Configuration is written.
 	Outputs []Writer `yaml:"outputs,omitempty"`
-
-	// ContinueIfInputEmpty indicates should pipeline continue when the
-	// the input result is empty. This is useful when we want to run outputs
-	// even the input is empty.
-	ContinueIfInputEmpty bool
 }
 
 // Execute executes each step in the sequence, returning immediately after encountering
@@ -104,10 +99,6 @@ func (p Pipeline) ExecuteWithCallback(callback PipelineExecuteCallbackFunc) erro
 		}
 		result = append(result, nodes...)
 	}
-	if len(result) == 0 && !p.ContinueIfInputEmpty {
-		// no inputs to operate on
-		return nil
-	}
 
 	// apply operations
 	var err error
@@ -117,6 +108,9 @@ func (p Pipeline) ExecuteWithCallback(callback PipelineExecuteCallbackFunc) erro
 			callback(op)
 		}
 		result, err = op.Filter(result)
+		// TODO: This len(result) == 0 should be removed and empty result list should be
+		// handled by outputs. However currently the some writer like LocalPackageReadWriter
+		// will clear the output directory and which will cause unpredictable results
 		if len(result) == 0 || err != nil {
 			return errors.Wrap(err)
 		}