Fixed error where creating a new author would fail when the book initially had no authors

frontend/src/components/BooksAddEdit.vue

@@ -104,6 +104,7 @@
         bookID: this.$route.params.id,
         edit: false,
         book: {
+          authors: [],
           title: '',
           description: '',
           isbn: '',
@@ -114,8 +115,7 @@
           publisher: {
             id: 0,
             name: ''
-          },
+          }
-          Authors: []
         },
         publishers: [],
         authors: [],
@@ -159,6 +159,12 @@
                 name: as[i].forename + ' ' + as[i].lastname
               }
             }
+
+            // Workaround when the book don't has any authors
+            if (this.book.authors === null) {
+              this.book.authors = []
+            }
+            console.log(this.book.authors)
           })
           .catch(e => {
             this.errorNotification(e)
@@ -242,12 +248,15 @@
           // Add all newly created authors to it
           let as = this.newAuthors
 
+          console.log(this.book, this.newAuthors)
+
           for (const i in as) {
             this.book.authors.push({
               id: 0,
               name: as[i]
             })
           }
+          console.log(this.book.authors, this.newAuthors)
 
           // Beautify all Authors aka split the names in forename and lastname
           for (const i in this.book.authors) {