I've tried to install openSUSE Tumbleweed 20200122 using Live KDE USB stick,
but installer had failed with the following backtrace:

2020-01-26 13:47:06 <3> localhost.localdomain(3779) [Ruby] yast/wfm.rb:253
Client /usr/share/YaST2/clients/inst_repositories_initializa
tion.rb failed with 'undefined method `each_with_object' for "":String'
(NoMethodError).
/usr/share/YaST2/lib/y2packager/product_control_product.rb:57:in `products'
/usr/share/YaST2/lib/y2packager/product_reader.rb:87:in `all_products'
/usr/share/YaST2/lib/y2packager/product_reader.rb:125:in
`available_base_products'
/usr/share/YaST2/lib/y2packager/product.rb:107:in `available_base_products'
/usr/share/YaST2/lib/y2packager/clients/inst_repositories_initialization.rb:133:in
`products'
/usr/share/YaST2/lib/y2packager/clients/inst_repositories_initialization.rb:52:in
`main'
/usr/share/YaST2/clients/inst_repositories_initialization.rb:3:in `<top
(required)>'
/usr/lib64/ruby/vendor_ruby/2.6.0/yast/wfm.rb:318:in `eval'
/usr/lib64/ruby/vendor_ruby/2.6.0/yast/wfm.rb:318:in `run_client'
/usr/lib64/ruby/vendor_ruby/2.6.0/yast/wfm.rb:206:in `call_builtin'
/usr/lib64/ruby/vendor_ruby/2.6.0/yast/wfm.rb:206:in `call_builtin_wrapper'
/usr/lib64/ruby/vendor_ruby/2.6.0/yast/wfm.rb:195:in `CallFunction'
/usr/share/YaST2/modules/ProductControl.rb:1338:in `RunFrom'
/usr/share/YaST2/modules/ProductControl.rb:1507:in `Run'
/usr/share/YaST2/lib/installation/clients/inst_worker_initial.rb:101:in `main'

It seems that control.xml in Live KDE build doesn't have software/base_products
defined. Disabling ProductControlProduct.products (by making it always return
@product) helps resolving the issue.