Dont output nil; test nil & omitempty

pkg/conversion/queryparams/convert.go

@@ -74,7 +74,13 @@ func addParam(values url.Values, tag string, omitempty bool, value reflect.Value
 	if omitempty && zeroValue(value) {
 		return
 	}
-	values.Add(tag, fmt.Sprintf("%v", value.Interface()))
+	val := ""
+	iValue := fmt.Sprintf("%v", value.Interface())
+
+	if iValue != "<nil>" {
+		val = iValue
+	}
+	values.Add(tag, val)
 }
 
 func addListOfParams(values url.Values, tag string, omitempty bool, list reflect.Value) {

pkg/conversion/queryparams/convert_test.go

@@ -151,6 +151,12 @@ func TestConvert(t *testing.T) {
 			},
 			expected: url.Values{"ptr": {"<nil>"}, "bptr": {"true"}},
 		},
+		{
+			input: &baz{
+				Ptr: intp(5),
+			},
+			expected: url.Values{"ptr": {"5"}},
+		},
 	}
 
 	for _, test := range tests {