[471456] Fix NPE on SessionEditorInput.exists()

- Fix potential NPE on SessionEditorInput.exists() when Resource has not
ResourceSet. This can occurs for example with metamodel resource.

Bug: 471456
Change-Id: I6242312937b9fffd1f6190ed1a283b09d2e3ec46
Signed-off-by: Esteban Dugueperoux <esteban.dugueperoux@obeo.fr>

1 files changed, 1 insertions, 1 deletions

diff --git a/plugins/org.eclipse.sirius.ui/src/org/eclipse/sirius/ui/business/api/session/SessionEditorInput.java b/plugins/org.eclipse.sirius.ui/src/org/eclipse/sirius/ui/business/api/session/SessionEditorInput.java
index 18b940bbb8..eb3694978c 100644
--- a/plugins/org.eclipse.sirius.ui/src/org/eclipse/sirius/ui/business/api/session/SessionEditorInput.java
+++ b/plugins/org.eclipse.sirius.ui/src/org/eclipse/sirius/ui/business/api/session/SessionEditorInput.java
@@ -310,7 +310,7 @@ public class SessionEditorInput extends URIEditorInput {
             EObject input = getInput(false);
             if (input != null) {
                 Resource resource = input.eResource();
-                if (resource != null) {
+                if (resource != null && resource.getResourceSet() != null) {
                     exists = resource.getResourceSet().getURIConverter().exists(resource.getURI(), null);
                 }
             }