Errors caused by using Octobers `CMS_STRICT_VARIABLES` environment option

[SamBrishes]

The use of Octobers / Twigs CMS_STRICT_VARIABLES environment variable leads to some errors on the individual partials if a variable or object key is not defined.

See image below.

Some of these errors have already been fixed, but testing of each partial is still necessary.

• [x] addressform
• [x] addresslist
• [x] addressselector
• [x] cart
• [x] checkout
• [x] currencypicker
• [x] customerprofile
• [x] discountapplier
• [x] enhancedecommerceanalytics
• [x] malldependencies
• [x] myaccount
• [x] oderslist
• [x] paymentmethodselector
• [x] product
• [x] productreviews
• [x] products
• [x] productsfilter
• [x] quickcheckout
• [x] shippingmethodselector
• [x] signup
• [x] wishlistbutton
• [x] wishlists

[SamBrishes]

See already pushed commits

• c0f837c626be96bf4fd1ada89c41cf6f8455f205
• e0a4c5e1872c8eac705b48bfb1ab0a68d1753ae8
• 8e8e154d8a38fa5c881018041b038b97689c0dd3