feat: error handling for undefined schema version (#1342)

* feat: error handling for undefined schema version

* docs: error codes

* chore: changelog

taskfile/read/taskfile.go

@@ -147,6 +147,11 @@ func Taskfile(
 			return nil, err
 		}
 
+		// Check that the Taskfile is set and has a schema version
+		if t == nil || t.Version == nil {
+			return nil, &errors.TaskfileVersionNotDefined{URI: node.Location()}
+		}
+
 		// Annotate any included Taskfile reference with a base directory for resolving relative paths
 		if node, isFileNode := node.(*FileNode); isFileNode {
 			_ = t.Includes.Range(func(key string, includedFile taskfile.IncludedTaskfile) error {