Fix MCQ option 0 not showing hints (#329)

* Fix MCQ option 0 not displaying intent and hints

Truthy check, 0 is false. T-T

* Format file

* Keep one mock data as option 0

* Bump version

Author: remo5000

package.json

@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "cadet-frontend",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "scripts-info": {
     "format": "Format source code",
     "start": "Start the Webpack development server",

src/components/workspace/MCQChooser.tsx

@@ -60,7 +60,7 @@ class MCQChooser extends React.PureComponent<IMCQChooserProps, State> {
         mcqOption: i
       })
     }
-    const shouldDisplayMessage = this.props.mcq.solution && this.props.mcq.choices[i].hint
+    const shouldDisplayMessage = this.props.mcq.solution !== null && this.props.mcq.choices[i].hint
     if (shouldDisplayMessage) {
       const hintElement = <Markdown content={this.props.mcq.choices[i].hint!} />
       if (i === this.props.mcq.solution) {
@@ -86,8 +86,8 @@ class MCQChooser extends React.PureComponent<IMCQChooserProps, State> {
     solution: number | null
   ): Intent => {
     const active = currentOption === chosenOption
-    const correctOptionSelected = active && solution && currentOption === solution
-    if (!solution) {
+    const correctOptionSelected = active && solution !== null && currentOption === solution
+    if (solution === null) {
       return Intent.NONE
     } else if (active && correctOptionSelected) {
       return Intent.SUCCESS

src/mocks/assessmentAPI.ts

@@ -213,7 +213,7 @@ What's your favourite dinner food?
     id: 2,
     library: mockCurveLibrary,
     type: 'mcq',
-    solution: 2
+    solution: 0
   },
   {
     answer: 3,