Fixed exception in attribute annotation mode (#571)

* Fixed bug Cannot read property 'current' of undefined at AAMModel.setupAttributeValue

* Updated changelog

CHANGELOG.md

@@ -36,6 +36,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Auto annotation fail for multijob tasks
 - Installation of CVAT with OpenVINO on the Windows platform
 - Background color was always black in utils/mask/converter.py
+- Exception in attribute annotation mode when a label are switched to a value without any attributes
 - Handling of wrong labelamp json file in auto annotation (https://github.com/opencv/cvat/issues/554)
 
 ### Security

cvat/apps/engine/static/engine/js/attributeAnnotationMode.js

@@ -130,14 +130,18 @@ class AAMModel extends Listener {
     _activate() {
         if (this._activeAAM && this._active) {
             const { label } = this._active;
-            const attrId = +this._attrIdByIdx(label, this._attrNumberByLabel[label].current);
+
 
             const [xtl, ytl, xbr, ybr] = this._bbRect(this._currentShapes[this._activeIdx]
                 .interpolation.position);
             this._focus(xtl - this._margin, xbr + this._margin,
                 ytl - this._margin, ybr + this._margin);
             this.notify();
-            this._active.activeAttribute = attrId;
+
+            if (typeof (this._attrNumberByLabel[label]) !== 'undefined') {
+                const attrId = +this._attrIdByIdx(label, this._attrNumberByLabel[label].current);
+                this._active.activeAttribute = attrId;
+            }
         } else {
             this.notify();
         }
@@ -211,6 +215,9 @@ class AAMModel extends Listener {
         }
 
         const curAttr = this._attrNumberByLabel[this._active.label];
+        if (typeof (curAttr) === 'undefined') {
+            return;
+        }
 
         if (curAttr.end < 2) {
             return;
@@ -238,6 +245,10 @@ class AAMModel extends Listener {
         }
         const { label } = this._active;
         const frame = window.cvat.player.frames.current;
+        if (typeof (this._attrNumberByLabel[label]) === 'undefined') {
+            return;
+        }
+
         const attrId = this._attrIdByIdx(label, this._attrNumberByLabel[label].current);
         const attrInfo = window.cvat.labelsInfo.attrInfo(attrId);
         if (key >= attrInfo.values.length) {
@@ -266,8 +277,11 @@ class AAMModel extends Listener {
     generateHelps() {
         if (this._active) {
             const { label } = this._active;
-            const attrId = +this._attrIdByIdx(label, this._attrNumberByLabel[label].current);
+            if (typeof (this._attrNumberByLabel[label]) !== 'undefined') {
-            return [this._helps[attrId].title, this._helps[attrId].help, `${this._activeIdx + 1}/${this._currentShapes.length}`];
+                const attrId = +this._attrIdByIdx(label, this._attrNumberByLabel[label].current);
+                return [this._helps[attrId].title, this._helps[attrId].help, `${this._activeIdx + 1}/${this._currentShapes.length}`];
+            }
+            return ['No Attributes Found', '', `${this._activeIdx + 1}/${this._currentShapes.length}`];
         }
         return ['No Shapes Found', '', '0/0'];
     }