Adapt to change in Gerrit core

With change I89c0c68bf Response#value() is now throwing Exception which
needs to be handled.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Ifc453f43826f1ce0bcfb042ab6a2cf22b4cf1fb0
diff --git a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeletePreconditions.java b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeletePreconditions.java
index 4b8d30d..f72b338 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeletePreconditions.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeletePreconditions.java
@@ -27,14 +27,12 @@
 import com.google.gerrit.extensions.common.ProjectInfo;
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.ResourceConflictException;
-import com.google.gerrit.extensions.restapi.RestApiException;
 import com.google.gerrit.reviewdb.client.BranchNameKey;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.permissions.GlobalPermission;
 import com.google.gerrit.server.permissions.PermissionBackend;
-import com.google.gerrit.server.permissions.PermissionBackendException;
 import com.google.gerrit.server.permissions.ProjectPermission;
 import com.google.gerrit.server.project.ProjectResource;
 import com.google.gerrit.server.query.change.ChangeData;
@@ -136,17 +134,18 @@
   }
 
   private void assertHasNoChildProjects(ProjectResource rsrc) throws CannotDeleteProjectException {
+    List<ProjectInfo> children;
     try {
-      List<ProjectInfo> children = listChildProjectsProvider.get().withLimit(1).apply(rsrc).value();
-      if (!children.isEmpty()) {
-        throw new CannotDeleteProjectException(
-            "Cannot delete project because it has at least one child: "
-                + Iterables.getOnlyElement(children).name);
-      }
-    } catch (StorageException | PermissionBackendException | RestApiException e) {
+      children = listChildProjectsProvider.get().withLimit(1).apply(rsrc).value();
+    } catch (Exception e) {
       throw new CannotDeleteProjectException(
           String.format("Unable to verify if '%s' has children projects.", rsrc.getName()));
     }
+    if (!children.isEmpty()) {
+      throw new CannotDeleteProjectException(
+          "Cannot delete project because it has at least one child: "
+              + Iterables.getOnlyElement(children).name);
+    }
   }
 
   private void assertIsNotSubmodule(Project.NameKey projectNameKey)