fixed avatar of add member autocomplete popup

frontend/src/component/Dashboard/MemberList.jsx

 import React from 'react'
 import PropTypes from 'prop-types'
 // import { Checkbox } from 'tracim_frontend_lib'
+import { generateAvatarFromPublicName } from 'tracim_frontend_lib'
 
 require('./MemberList.styl')
 
                             onClick={() => props.onClickKnownMember(u)}
                             key={u.user_id}
                           >
-                            <div className='autocomplete__item__avatar primaryColorBorder'>
-                              <img src={u.avatar_url} />
+                            <div className='autocomplete__item__avatar'>
+                              <img src={u.avatar_url ? u.avatar_url : generateAvatarFromPublicName(u.public_name)} />
                             </div>
 
                             <div className='autocomplete__item__name'>

frontend/src/component/Dashboard/MemberList.styl

               width 45px
               height 45px
               border-radius 50%
-              border-width 1px
-              border-style solid
             &__name
               margin-left 15px
       .name__input