MOBILE-2431 courses: Fix webservice not available error

src/core/course/pages/section/section.ts

@@ -209,7 +209,7 @@ export class CoreCourseSectionPage implements OnDestroy {
             // Get the overview files.
             if (this.course.overviewfiles) {
                 this.course.imageThumb = this.course.overviewfiles[0] && this.course.overviewfiles[0].fileurl;
-            } else {
+            } else if (this.coursesProvider.isGetCoursesByFieldAvailable()) {
                 promises.push(this.coursesProvider.getCoursesByField('id', this.course.id).then((coursesInfo) => {
                     if (coursesInfo[0] && coursesInfo[0].overviewfiles && coursesInfo[0].overviewfiles[0]) {
                         this.course.imageThumb = coursesInfo[0].overviewfiles[0].fileurl;

src/core/course/providers/default-format.ts

@@ -97,6 +97,15 @@ export class CoreCourseFormatDefaultHandler implements CoreCourseFormatHandler {
      * @return {any|Promise<any>} Current section (or promise resolved with current section).
      */
     getCurrentSection(course: any, sections: any[]): any | Promise<any> {
+        if (!this.coursesProvider.isGetCoursesByFieldAvailable()) {
+            // Cannot get the current section, return the first one.
+            if (sections[0].id != CoreCourseProvider.ALL_SECTIONS_ID) {
+                return sections[0];
+            }
+
+            return sections[1];
+        }
+
         // We need the "marker" to determine the current section.
         return this.coursesProvider.getCoursesByField('id', course.id).catch(() => {
             // Ignore errors.

src/core/course/providers/helper.ts

@@ -1007,7 +1007,9 @@ export class CoreCourseHelperProvider {
             });
 
             // Prefetch other data needed to render the course.
-            promises.push(this.coursesProvider.getCoursesByField('id', course.id));
+            if (this.coursesProvider.isGetCoursesByFieldAvailable()) {
+                promises.push(this.coursesProvider.getCoursesByField('id', course.id));
+            }
             promises.push(this.courseProvider.getActivitiesCompletionStatus(course.id));
 
             return this.utils.allPromises(promises);

src/core/courses/pages/my-courses/my-courses.ts

@@ -96,7 +96,7 @@ export class CoreCoursesMyCoursesPage implements OnDestroy {
 
             this.courseIds = courseIds.join(',');
 
-            if (this.courseIds) {
+            if (this.courseIds && this.coursesProvider.isGetCoursesByFieldAvailable()) {
                 // Load course image of all the courses.
                 promises.push(this.coursesProvider.getCoursesByField('ids', this.courseIds).then((coursesInfo) => {
                     coursesInfo = this.utils.arrayToObject(coursesInfo, 'id');

src/core/courses/pages/my-overview/my-overview.ts

@@ -233,7 +233,7 @@ export class CoreCoursesMyOverviewPage implements OnDestroy {
 
             this.courseIds = courseIds.join(',');
 
-            if (this.courseIds) {
+            if (this.courseIds && this.coursesProvider.isGetCoursesByFieldAvailable()) {
                 // Load course image of all the courses.
                 promises.push(this.coursesProvider.getCoursesByField('ids', this.courseIds).then((coursesInfo) => {
                     coursesInfo = this.utils.arrayToObject(coursesInfo, 'id');