"Starting java language server" processing stops before 100% on workspaces with a non-existing project directory (causing "Classpath is incomplete")

The following workspace opens ok and "starting java language server" process finishes at 100%

{
	"folders": [
        {
            "path":"simple-project1"
        },
        {
            "path":"other-existing-dir"
        }
    ]
}

However the one below one stops at 30% because the first project path in the workspace does not exist. This causes also the following error when clicking on the code of Main.java: "Classpath is incomplete: Only syntax errors will be reported":

{
	"folders": [
        {
            "path":"non-existing-dir"
        },    
        {
            "path":"simple-project1"
        },
        {
            "path":"other-existing-dir"
        }
    ]
}

Environment

• Operating System: Ubuntu 18.04.3 LTS
• JDK version: 13
• Visual Studio Code version: 1.42.1
• Java extension version: 0.57.0 (got from changelog)

Steps To Reproduce

• First open working-workspace.code-workspace and see the thumbs-up symbol on down-right side.
• Then open problematic-workspace.code-workspace and see the thumbs-down symbol on down-right side.

Current Result

Expected Result

Additional Informations

code-missing-project-path-issue.tar.gz

Beginne damit, code-missing-project-path-issue.tar.gz zu extrahieren und working-workspace.code-workspace sowie problematic-workspace.code-workspace in VS Code zu öffnen. Reproduziere zuerst den Start des Language Servers mit dem nicht vorhandenen Projektpfad und vergleiche anschließend den Fortschritt und die Diagnosen mit dem funktionierenden Workspace. Fertig bedeutet, dass der Start 100 % erreicht und Main.java keine unvollständige classpath mehr meldet.