1) Error:
AliasAndImplicationImporterTest#test_: The alias and implication importer given a valid list should process it. :
NoMethodError: undefined method `role' for nil:NilClass
app/models/tag_alias.rb:124:in `rescue in process!'
app/models/tag_alias.rb:135:in `process!'
app/models/tag_alias.rb:93:in `approve!'
app/logical/alias_and_implication_importer.rb:90:in `block (2 levels) in parse'
app/logical/alias_and_implication_importer.rb:82:in `map'
app/logical/alias_and_implication_importer.rb:82:in `block in parse'
app/logical/alias_and_implication_importer.rb:81:in `parse'
app/logical/alias_and_implication_importer.rb:13:in `process!'
test/unit/alias_and_implication_importer_test.rb:24:in `block (4 levels) in <class:AliasAndImplicationImporterTest>'
test/unit/alias_and_implication_importer_test.rb:23:in `block (3 levels) in <class:AliasAndImplicationImporterTest>'
