RFR: 8375016: Several catch blocks for NullPointerExceptions exist in the codebase [v6]

[Christopher Schnick]

> This PR replaces various catch blocks for NPEs by proper null checks. It looks like a lot but most of the binding changes are just variants of the same approach. The test cases have been adapted to not check for NPEs anymore.
> 
> The PrismFontFactory change to a RuntimeException was made because I don't see how the try block can throw an NPE.

Christopher Schnick has updated the pull request incrementally with one additional commit since the last revision:

  Add test clarifying generics handling

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/2032/files
  - new: https://git.openjdk.org/jfx/pull/2032/files/695c4da7..6d683d3a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=2032&range=05
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=2032&range=04-05

  Stats: 21 lines in 1 file changed: 21 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/2032.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/2032/head:pull/2032

PR: https://git.openjdk.org/jfx/pull/2032