Ignore errors when parsing books and treat them as old books

In previous versions there was a mistake with book handled which
may leave books in a broken state, this tries to handle that

src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java

@@ -78,7 +78,11 @@ class CraftMetaBook extends CraftMetaItem implements BookMeta {
             for (int i = 0; i < pages.size(); i++) {
                 String page = pages.getString(i);
                 if (resolved) {
+                    try {
                         page = CraftChatMessage.fromComponent(ChatSerializer.a(page));
+                    } catch (Exception e) {
+                        // Ignore and treat as an old book
+                    }
                 }
                 pageArray[i] = page;
             }

src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBookSigned.java

@@ -39,7 +39,11 @@ class CraftMetaBookSigned extends CraftMetaBook implements BookMeta {
             for (int i = 0; i < pages.size(); i++) {
                 String page = pages.getString(i);
                 if (resolved) {
+                    try {
                         page = CraftChatMessage.fromComponent(ChatSerializer.a(page));
+                    } catch (Exception e) {
+                        // Ignore and treat as an old book
+                    }
                 }
                 pageArray[i] = page;
             }