Fix reporting for images without CVEs

Signed-off-by: Christian Dupuis <cd@atomist.com>

query/index.go

@@ -85,6 +85,9 @@ func ForBaseImageInIndex(digest digest.Digest, workspace string, apiKey string)
 			CreatedAt:  ii.CreatedAt,
 			Tags:       manifestList[0].Tags,
 			Repository: *repository,
+			Report: []Report{{
+				Total: -1,
+			}},
 		}
 		return &[]Image{image}, nil
 	}

query/query.go

@@ -36,6 +36,7 @@ type ManifestList struct {
 }
 
 type Report struct {
+	Total       int64 `edn:"vulnerability.report/total"`
 	Critical    int64 `edn:"vulnerability.report/critical"`
 	High        int64 `edn:"vulnerability.report/high"`
 	Medium      int64 `edn:"vulnerability.report/medium"`