RFR 8146602: jdk/test/sun/misc/URLClassPath/ClassnameCharTest.java test fails with NullPointerException

[Svetlana Nikandrova]

Hello,

please review this test update. Test do not consider that exception 
could happen while variable "server" is not initialized yet. As a result 
log shows NPE instead of the real exception which is irrecoverably lost. 
I added check for "null" to prevent this situation.
Also did some code-style refactoring: IMHO "all-code-in-one-line" 
methods are really hard to read.

Webrev: http://cr.openjdk.java.net/~snikandrova/8146602/webrev.00/ 
<http://cr.openjdk.java.net/%7Esnikandrova/8146602/webrev.00/>
  JBS: https://bugs.openjdk.java.net/browse/JDK-8146602

Thank you,
Svetlana