[FIX] core: don't require xlrd

Despite being part of the requirement.txt, xlrd apparently was still
optional-ish, and absent from some environments like the iotbox.

Restore this by only monkeypatching xlrd if it's actually present.

closes odoo/odoo#63045

X-original-commit: c36aa16c2cc431a1e3b3bb7047dbae4fcac13946
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

odoo/tools/_monkeypatches.py

@@ -1,15 +1,18 @@
-from xlrd import xlsx
-from lxml import etree
-
-# xlrd.xlsx supports defusedxml, defusedxml's etree interface is broken
-# (missing ElementTree and thus ElementTree.iter) which causes a fallback to
-# Element.getiterator(), triggering a warning before 3.9 and an error from 3.9.
-#
-# We have defusedxml installed because zeep has a hard dep on defused and
-# doesn't want to drop it (mvantellingen/python-zeep#1014).
-#
-# Ignore the check and set the relevant flags directly using lxml as we have a
-# hard dependency on it.
-xlsx.ET = etree
-xlsx.ET_has_iterparse = True
-xlsx.Element_has_iter = True
+try:
+    from xlrd import xlsx
+except ImportError:
+    pass
+else:
+    from lxml import etree
+    # xlrd.xlsx supports defusedxml, defusedxml's etree interface is broken
+    # (missing ElementTree and thus ElementTree.iter) which causes a fallback to
+    # Element.getiterator(), triggering a warning before 3.9 and an error from 3.9.
+    #
+    # We have defusedxml installed because zeep has a hard dep on defused and
+    # doesn't want to drop it (mvantellingen/python-zeep#1014).
+    #
+    # Ignore the check and set the relevant flags directly using lxml as we have a
+    # hard dependency on it.
+    xlsx.ET = etree
+    xlsx.ET_has_iterparse = True
+    xlsx.Element_has_iter = True