JT-21293: Constrains validation exception. Causes: 1: Property [AttachmentThumbnail: id = 100-379[up-to-date].name] can't be empty.

at com.jetbrains.teamsys.dnq.database.TransientSessionImpl.checkBeforeSaveChangesConstraints(TransientSessionImpl.java:645)
	at com.jetbrains.teamsys.dnq.database.TransientSessionImpl.flushChanges(TransientSessionImpl.java:723)
	at com.jetbrains.teamsys.dnq.database.TransientSessionImpl.flush(TransientSessionImpl.java:155)
	at com.jetbrains.teamsys.dnq.database.TransientSessionImpl.commit(TransientSessionImpl.java:172)
	at jetbrains.mps.webr.runtime.templateComponent.TemplateActionController.endResponse(TemplateActionController.java:347)
	at jetbrains.mps.webr.runtime.templateComponent.TemplateActionController.access$000(TemplateActionController.java:30)
	at jetbrains.mps.webr.runtime.templateComponent.TemplateActionController$1.invoke(TemplateActionController.java:95)
	at jetbrains.mps.webr.runtime.requestProcessor.ResponseFactory$2.doAction(ResponseFactory.java:87)
	at jetbrains.mps.webr.runtime.servlet.MainServlet.executeResponseAction(MainServlet.java:172)
	at jetbrains.mps.webr.runtime.servlet.MainServlet.doGet(MainServlet.java:123)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:648)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1336)
	at jetbrains.mps.webr.runtime.filter.QueryParameterFilter.doFilter(QueryParameterFilter.java:25)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1307)
	at org.eclipse.jetty.continuation.ContinuationFilter.doFilter(ContinuationFilter.java:137)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1307)
	at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:82)
	at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:242)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1307)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:453)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:559)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1072)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:382)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1006)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:365)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:926)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:988)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:627)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:51)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
	at java.lang.Thread.run(Thread.java:722)