Fix for Conditional Breakpoint not working in File class.

[SougandhS]

What it does

Handles all the exception caused while evaluating conditional breakpoint java.io.File class https://github.com/eclipse-jdt/eclipse.jdt.debug/issues/273

How to test

Author checklist

• [x] I have thoroughly tested my changes
• [x] The change is following the coding conventions
• [x] I have signed the Eclipse Contributor Agreement (ECA)

[iloveeclipse]

Would be very nice to have a regression test added, also please make sure there is one commit with proper commit message explaining the fix.

[iloveeclipse]

Also please rebase (do not merge with!) on latest master branch state.

[SougandhS]

Hi @iloveeclipse, done all the changes.