Account for server version being undefined in old releases

    checkServerVersion: function () {

      this.$store.dispatch('updateState')

      .then (() => {

        console.log(this.$store.state.apiState.version)

        var serverVersion = this.$store.state.apiState.version

        var serverVersionMajor = serverVersion.substring(0, 3)

        console.log(serverVersionMajor)

        var clientVersion = process.env.PACKAGE_VERSION

        var clientVersionMajor = clientVersion.substring(0, 3)

        console.log(clientVersionMajor)

        if (serverVersionMajor != clientVersionMajor) {

        var serverVersion = this.$store.state.apiState.version

        if (serverVersion != undefined) {

          var serverVersionMajor = serverVersion.substring(0, 3)

        }

        console.log(serverVersionMajor)

        if ((serverVersion == undefined) || (serverVersionMajor != clientVersionMajor)) {

          this.modalDialog("Version mismatch", "Client and microscope versions do not match. Consider updating your microscope software. Some functionality may currently be broken.", status='warning')

        }

      })