Update PlaceholderManager.java

[Yesitics]

Adjusted the PlaceholderManager to display maximum claims if the claims are empty.

[SpraxDev]

Hi @Yesitics, thanks for your interest in contributing to our project.

1. I've changed the target branch of your commit to development and rebased your branch on it (hence the force-push).
   Please create your PRs against it in the future (we'll add some info for that in the future so people actually know about that).
2. I've added missing import statements for your changes while I was at it already

BUT the code currently doesn't compile. You might have confused a + with : maybe because a : for the ternary operator is missing and breaking the code.

I've requested a code review from @ceze88, so when the code is fixed and the project can compile again he can check the changes and merge them 😃