Ontology download failed

[zhibor]

Describe the bug
Download project errors

To Reproduce
Steps to reproduce the behavior:

1. Go to the project list at https://webprotege.stanford.edu/#projects/list
2. Click the menu button for the project of interest
3. Select Download from the popup menu
4. See the error below

WebProtege Initialization Error
An error occurred during the initialization of WebProtege which prevented WebProtege from starting.

Error Message
java.nio.file.NoSuchFileException: /srv/protege/webprotege-data/data-store/project-data/0b6dcf4c-0ed4-4b80-9955-3117cd6333a2/change-data/change-data.binary
	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:116)
	at java.base/sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:219)
	at java.base/java.nio.file.Files.newByteChannel(Files.java:371)
	at java.base/java.nio.file.Files.newByteChannel(Files.java:422)
	at java.base/java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:420)
	at java.base/java.nio.file.Files.newInputStream(Files.java:156)
	at edu.stanford.bmir.protege.web.server.revision.HeadRevisionNumberFinder.getHeadRevisionNumber(HeadRevisionNumberFinder.java:50)
	at edu.stanford.bmir.protege.web.server.download.ProjectDownloadService.getHeadRevisionNumber(ProjectDownloadService.java:214)
	at edu.stanford.bmir.protege.web.server.download.ProjectDownloadService.downloadProject(ProjectDownloadService.java:84)
	at edu.stanford.bmir.protege.web.server.download.ProjectDownloadServlet.startProjectDownload(ProjectDownloadServlet.java:91)
	at edu.stanford.bmir.protege.web.server.download.ProjectDownloadServlet.doGet(ProjectDownloadServlet.java:81)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at edu.stanford.bmir.protege.web.server.filter.WebProtegeWebAppFilter.doFilter(WebProtegeWebAppFilter.java:75)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2549)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2538)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:829)

Expected behavior
Expect to export/download an ontology

Desktop (please complete the following information):

• OS: macOS
• Browser: Chrome, Safari
• Version: most recent

Additional context
None