fix: prevent course progress from being NaN if total assignment count is 0

Author: kaustavb12

dashboard/src/main/java/org/openedx/courses/presentation/AllEnrolledCoursesView.kt

@@ -431,11 +431,15 @@ fun CourseItem(
                         .fillMaxWidth()
                         .height(90.dp)
                 )
-                val progress: Float = try {
+                var progress: Float = try {
                     course.progress.assignmentsCompleted.toFloat() / course.progress.totalAssignmentsCount.toFloat()
                 } catch (_: ArithmeticException) {
                     0f
                 }
+
+                if (progress.isNaN()){
+                    progress = 0.0f
+                }
                 LinearProgressIndicator(
                     modifier = Modifier
                         .fillMaxWidth()