Invalid getter and annotation for nullable property

[velorb]

Describe the bug
Getter with nullable property has invalid return type. It happens when minOccurs="1" maxOccurs="1"

To Reproduce

            <s:complexType name="Test">
                <s:sequence>
                    <s:element minOccurs="1" maxOccurs="1" name="test" nillable="true" type="s:dateTime" />
                </s:sequence>
            </s:complexType>

     * Get test value
     * @return string
     */
    public function getTest(): string
    {
        return $this->test;
    }

Expected behavior

     * Get test value
     * @return string|null
     */
    public function getTest(): ?string
    {
        return $this->test;
    }

[mikaelcom]

Please try generator branch https://github.com/WsdlToPhp/PackageGenerator/tree/feature/issue-312 to validate the bug fix

[velorb]

it looks good now