better error message

dn.go

@@ -143,8 +143,8 @@ func ParseDN(str string) (*DN, error) {
 			}
 		} else if char == ',' || char == '+' {
 			// We're done with this RDN or value, push it
-			if attribute.Type == "" {
-				return nil, fmt.Errorf("missing attribute type")
+			if len(attribute.Type) == 0 {
+				return nil, errors.New("incomplete type, value pair")
 			}
 			attribute.Value = stringFromBuffer()
 			rdn.Attributes = append(rdn.Attributes, attribute)

dn_test.go

@@ -80,7 +80,7 @@ func TestErrorDNParsing(t *testing.T) {
 		"cn=Jim\\0":              "Got corrupted escaped character",
 		"DC=example,=net":        "DN ended with incomplete type, value pair",
 		"1=#0402486":             "Failed to decode BER encoding: encoding/hex: odd length hex string",
-		"test,DC=example,DC=com": "missing attribute type",
+		"test,DC=example,DC=com": "incomplete type, value pair",
 	}
 
 	for test, answer := range testcases {