LoadJobFileAppender explodes w/ NPE if load job name is not set (null)

[akurilov]

LoadJobFileAppender explodes w/ NPE if load job name is not set (null)

2017-06-13 15:22:17,962 JmDNS(a123.local.).State.Timer ERROR An exception occurred processing Appender 3rdPartyFile java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1645)
at com.emc.mongoose.ui.log.appenders.LoadJobLogFileManager.write(LoadJobLogFileManager.java:143)
at com.emc.mongoose.ui.log.appenders.LoadJobLogFileManager.write(LoadJobLogFileManager.java:155)
at com.emc.mongoose.ui.log.appenders.LoadJobFileAppender.append(LoadJobFileAppender.java:152)
at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:448)
at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:433)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:417)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:403)
at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2091)
at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:1993)
at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1852)
at org.apache.logging.slf4j.Log4jLogger.debug(Log4jLogger.java:119)
at javax.jmdns.impl.tasks.state.DNSStateTask.run(DNSStateTask.java:112)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)