update: 登录按钮

src/components/layout-element/login/app-login-button/app-login-button.vue

 <template>
     <div :class="[model.sysCss, 'app-login-button']" :style="containerStyle">
         <i-button @click="handleClick" :type="curStyle">
+            <template v-if="model.sysImage">
                 <i v-if="model.sysImage.iconcls" :class="model.sysImage.iconcls"/>
                 <img v-else-if="model.sysImage.imagePath" :src="model.sysImage.imagePath" />
+            </template>
             <span v-show="model.isShowCaption">{{ model.caption }}</span>
         </i-button>
     </div>