code.ResoureCompare: return an empty string for non implemented cases (slice/map of structs)

Author: a-hilaly

pkg/generate/code/compare.go

@@ -220,6 +220,7 @@ func compareNil(
 	case "list", "blob":
 		// for slice types, there is no nilability test. Instead, the normal
 		// value test checks length of slices.
+		return ""
 	case "boolean", "string", "character", "byte", "short", "integer", "long",
 		"float", "double", "timestamp", "structure", "map", "jsonvalue":
 		// if ackcompare.HasNilDifference(a.ko.Spec.Name, b.ko.Spec.Name) {
@@ -365,6 +366,7 @@ func compareMap(
 		// TODO(jaypipes): Implement this by walking the keys and struct values
 		// and comparing each struct individually, building up the fieldPath
 		// appropriately...
+		return ""
 	default:
 		panic("Unsupported shape type in generate.code.compareMap: " + shape.Type)
 	}