Error when outputting to log
A connection that resulted in a connection error was made. Then:
<pre>
java.util.concurrent.CompletionException: java.lang.IllegalStateException: Called endChange before beginChange
	at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273)
	at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280)
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1629)
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1618)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
Caused by: java.lang.IllegalStateException: Called endChange before beginChange
	at javafx.collections.ListChangeBuilder.endChange(ListChangeBuilder.java:538)
	at javafx.collections.ObservableListBase.endChange(ObservableListBase.java:205)
	at javafx.collections.ModifiableObservableListBase.add(ModifiableObservableListBase.java:155)
	at java.util.AbstractList.add(AbstractList.java:108)
	at com.speedment.tool.core.internal.component.UserInterfaceComponentImpl.showNotification(UserInterfaceComponentImpl.java:669)
	at com.speedment.tool.core.internal.component.UserInterfaceComponentImpl.showNotification(UserInterfaceComponentImpl.java:664)
	at com.speedment.tool.core.internal.component.UserInterfaceComponentImpl.showNotification(UserInterfaceComponentImpl.java:659)
	at com.speedment.tool.core.internal.component.UserInterfaceComponentImpl.lambda$start$2(UserInterfaceComponentImpl.java:179)
	at com.speedment.common.logger.internal.AbstractLogger.lambda$log$5(AbstractLogger.java:455)
	at java.util.concurrent.ConcurrentHashMap$KeySetView.forEach(ConcurrentHashMap.java:4649)
	at java.util.Collections$SetFromMap.forEach(Collections.java:5476)
	at com.speedment.common.logger.internal.AbstractLogger.log(AbstractLogger.java:455)
	at com.speedment.common.logger.internal.AbstractLogger.log(AbstractLogger.java:422)
	at com.speedment.common.logger.internal.AbstractLogger.error(AbstractLogger.java:343)
	at com.speedment.common.logger.internal.SystemOutLogger.error(SystemOutLogger.java:25)
	at com.speedment.runtime.core.internal.component.ConnectionPoolComponentImpl.newConnection(ConnectionPoolComponentImpl.java:122)
	at com.speedment.runtime.core.internal.component.ConnectionPoolComponentImpl.getConnection(ConnectionPoolComponentImpl.java:95)
	at com.speedment.runtime.core.internal.component.ConnectionPoolComponentImpl.getConnection(ConnectionPoolComponentImpl.java:79)
	at com.speedment.runtime.core.internal.db.AbstractDbmsMetadataHandler.getConnection(AbstractDbmsMetadataHandler.java:779)
	at com.speedment.runtime.core.internal.db.AbstractDbmsMetadataHandler.lambda$readSchemaMetadata$4(AbstractDbmsMetadataHandler.java:171)
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1626)
	... 5 more
</pre>