Handle invalid timestamps

* calibre-db.el (calibre-db--parse-timestamp): Return nil instead of
  signalling an error when calling parse-iso8601-time-string with an
  invalid string.

* calibre-core.el (calibre-book--print-info): Check that pubdate is
  non-nil before attempting to format it.

* etc/NEWS: Mention the fixing of this bug.

Some time strings which parse successfully (although potentially to
nonsensical time stamps) on GNU/Linux signal an error on Windows,
making it impossible to open the *Library* buffer if a library
contains a book with such a time string.

calibre-core.el

@@ -189,7 +189,9 @@ BOOK is a `calibre-book'."
                                (series-index (if (calibre-book-series book) (format "%.1f" (calibre-book-series-index book)) ""))
                                (tags (string-join (calibre-book-tags book) ", "))
                                (formats (string-join (mapcar (lambda (f) (upcase (symbol-name f))) (calibre-book-formats book)) ", "))
-                               (pubdate (format-time-string calibre-library-time-format (calibre-book-pubdate book))))))
+                               (pubdate (if (calibre-book-pubdate book)
+                                            (format-time-string calibre-library-time-format (calibre-book-pubdate book))
+                                          "Invalid")))))
                          calibre-library-columns))))
 
 (defun calibre-book--file (book format)

calibre-db.el

@@ -34,7 +34,7 @@
 (defun calibre-db--parse-timestamp (timestamp)
   "Return a Lisp timestamp from TIMESTAMP.
 TIMESTAMP is a string of the form YYYY-MM-DD HH:MM:SS.xxxxxx+00:00."
-  (parse-iso8601-time-string (string-replace " " "T" timestamp)))
+  (ignore-errors (parse-iso8601-time-string (string-replace " " "T" timestamp))))
 
 (defun calibre-db--make-book (entry)
   "Create a `calibre-book' from ENTRY.

etc/NEWS

@@ -6,6 +6,11 @@ See the end of the file for license conditions.
 This file is about changes in calibre.el, the Emacs client for
 Calibre.
 
+
+* Changes in calibre.el 1.3.4
+** Fix a timestamp parsing bug on Windows
+Some timestamps signalled errors when parsed on Windows.
+
 
 * Changes in calibre.el 1.3.3