学习明细如果没有不再调用接口

pages/learningStatistics/learningStatistics.vue

@@ -167,8 +167,10 @@
 						}
 						this.chartData.categories = categories;
 						this.chartData.series = [{name:'月',data:data}];
+						if(this.studyInfos){
 							this.userStudyTime();
 						}
+					}
 				})
 			},
 			userCoursePackBar(packFileId,orderId,state){