karyotype display fails if a guide has no associated chromosome

In statistics page, if a guide has no associated chromosome, the karyotype display fails with such an error:

Uncaught (in promise) TypeError: guide.parentConnection.edges[0] is undefined          StatisticsView.vue:240:6
    karyotypeObjects StatisticsView.vue:240
    karyotypeObjects StatisticsView.vue:237
    run reactivity.esm-bundler.js:178
    get value reactivity.esm-bundler.js:1147
    unref reactivity.esm-bundler.js:1026
    get reactivity.esm-bundler.js:1032
    default StatisticsView.vue:477
    renderFnWithContext runtime-core.esm-bundler.js:766
    renderSlot runtime-core.esm-bundler.js:2824
    default panel.esm.js:158
    renderFnWithContext runtime-core.esm-bundler.js:766
    setup runtime-core.esm-bundler.js:1969
    renderComponentRoot runtime-core.esm-bundler.js:816
    componentUpdateFn runtime-core.esm-bundler.js:5764
    run reactivity.esm-bundler.js:178
    update runtime-core.esm-bundler.js:5814
    callWithErrorHandling runtime-core.esm-bundler.js:158
    flushJobs runtime-core.esm-bundler.js:357

How to reproduce the bug

In neo4j db, the following query remove the HAS_FEATURE relationship that is used to link guide to chromosome.

MATCH (n:Guide {id: 'GD_00000'}) <-[r:HAS_FEATURE]- (c:Chromosome) DELETE r;