fix: handle ImportError when installing country fixtures

[sagarvora]

This change is required for moving regional functionality into a separate app. os.path.exists succeeds on erpnext/regional/india even after pulling ERPNext with India-specific code removed. This is because git does not remove empty folders when pulling changes.

Solution: Allow ImportError to pass silently instead of checking path. This would mean that install_country_fixtures will work only if country/setup.py or country/setup/__init__.py file is found. ImportError is the parent exception of ModuleNotFoundError, which is what was getting raised previously:

Traceback (most recent call last):
12:00:28 web.1            |   File "apps/erpnext/erpnext/setup/doctype/company/company.py", line 429, in install_country_fixtures
12:00:28 web.1            |     frappe.get_attr(module_name)(company, False)
12:00:28 web.1            |   File "apps/frappe/frappe/__init__.py", line 1224, in get_attr
12:00:28 web.1            |     return getattr(get_module(modulename), methodname)
12:00:28 web.1            |   File "apps/frappe/frappe/__init__.py", line 1000, in get_module
12:00:28 web.1            |     return importlib.import_module(modulename)
12:00:28 web.1            |   File "/usr/lib/python3.9/importlib/__init__.py", line 127, in import_module
12:00:28 web.1            |     return _bootstrap._gcd_import(name[level:], package, level)
12:00:28 web.1            |   File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
12:00:28 web.1            |   File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
12:00:28 web.1            |   File "<frozen importlib._bootstrap>", line 984, in _find_and_load_unlocked
12:00:28 web.1            | ModuleNotFoundError: No module named 'erpnext.regional.india.setup'

[ankush]

Doesn't require backport I think.

Add label if reqd.