message: fix(frontend): adds null check in stream activity to remove console errors
diff: <!-- COMMITS -->
  <v-card
  - v-else-if="lastActivity.resourceType === 'commit'"
  + v-else-if="lastActivity.resourceType === 'commit' && commit"
  class="activity-card"
  :flat="$vuetify.theme.dark"
  >
  small
  color="primary"
  >
  - <v-icon small class="float-left" light>mdi-source-branch</v-icon>
  + <v-icon v-if="commit" small class="float-left" light>
  + mdi-source-branch
  + </v-icon>
  {{ commit.branchName }}
  </v-chip>
  <span v-if="lastActivity.actionType === 'commit_create'">
  