Check null for the packages field of ClassLoader

[IssueFloppa]

allows the mod to run under modern java irrespective of method

[Imran-imtiaz48]

The recent update to the removePackageField method introduces a notable improvement in handling reflection for accessing the packages field of ClassLoader. The addition of a null check for packagesField ensures that the method gracefully handles scenarios where reflection access might be restricted in newer Java versions, thereby enhancing compatibility and robustness. This change also adheres to best practices by directly retrieving the packagesField only once, reducing redundant reflection operations. The code remains clear and maintainable, though it could benefit from more specific exception handling or logging to provide better insight into potential issues during runtime. Overall, this update is a solid enhancement to the reflection handling mechanism.