[SNMP4J] Possible (minor) bug found

[inliner683 at gmx.de]

It seems to be a bug wrt. JDK logging in SNMP4j.

To reproduce it:

Startup the provided TestAgent with using

    LogFactory.setLogFactory(new JavaLogFactory());

Then use a mib browser and do a MIB walk from OID .1. or try to look at the
SNMP4J-LOG-MIB tables.

Now a Nullpointer Exception will be thrown in 
class Snmp4jLogMib and method createLoggerRow(int n, LogAdapter logger,int storageType)
which does

logger.getLogLevel().getLevel()

Here the loglevel returned is null which causes the nullpointer.

I looked at the JavalogAdapter, where the method fromJavaToSnmp4jLevel
is called. 

Ther the check

    if (level == null) {
      return null;
    }

could be the cause. None of the other logadapter return a null value here and
do not cause any problems.

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