Provide proper ELEMENT_DOES_NOT_EXIST code on missing jar files

This allows callers like JavaElementImageProvider or ClassFileEditor to
ignore and do not log bunch of errors caused by a single missing jar
file.

See eclipse-jdt/eclipse.jdt.ui#2245

Author: iloveeclipse

org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/JavaModelManager.java

@@ -27,6 +27,7 @@
 
 import java.io.*;
 import java.net.URI;
+import java.nio.file.NoSuchFileException;
 import java.text.MessageFormat;
 import java.time.Instant;
 import java.util.*;
@@ -2988,7 +2989,11 @@ public ZipFile getZipFile(IPath path, boolean checkInvalidArchiveCache) throws C
 			// file may exist but for some reason is inaccessible
 			ArchiveValidity reason=ArchiveValidity.INVALID;
 			addInvalidArchive(path, reason);
-			throw new CoreException(new Status(IStatus.ERROR, JavaCore.PLUGIN_ID, -1, Messages.status_IOException, e));
+			int code = -1;
+			if(e instanceof FileNotFoundException || e instanceof NoSuchFileException) {
+				code = IJavaModelStatusConstants.ELEMENT_DOES_NOT_EXIST;
+			}
+			throw new JavaModelException(new JavaModelStatus(code, e));
 		}
 	}