java: fallback to manifest.ImplTitle when there is no name

Signed-off-by: Alfredo Deza <adeza@anchore.com>

syft/cataloger/java/java_manifest.go

@@ -82,6 +82,12 @@ func selectName(manifest *pkg.JavaManifest, filenameObj archiveFilename) string
 		// Jenkins...
 		name = manifest.Extra["Extension-Name"]
 	}
+
+	// in situations where we hit this point and no name was
+	// determined, look at the Implementation-Title
+	if name == "" && manifest.ImplTitle != "" {
+		name = manifest.ImplTitle
+	}
 	return name
 }