Fixed base64 decode an empty string #1209

pkg/yqlib/decoder_base64.go

@@ -35,7 +35,6 @@ func (dec *base64Decoder) Decode(rootYamlNode *yaml.Node) error {
 	}
 	if buf.Len() == 0 {
 		dec.finished = true
-		return io.EOF
 	}
 	rootYamlNode.Kind = yaml.ScalarNode
 	rootYamlNode.Tag = "!!str"

pkg/yqlib/operator_encoder_decoder_test.go

@@ -243,6 +243,14 @@ var encoderDecoderOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::coolData:\n    a: apple\n",
 		},
 	},
+	{
+		description: "empty base64 decode",
+		skipDoc:     true,
+		expression:  `"" | @base64d`,
+		expected: []string{
+			"D0, P[], (!!str)::\n",
+		},
+	},
 }
 
 func TestEncoderDecoderOperatorScenarios(t *testing.T) {