Add test for Traceback in install @module

The problem was triggered when modular error was handled during
"dnf install @module" command.

dnf-docker-test/features/module-error-1.feature

@@ -0,0 +1,20 @@
+Feature: Show modular errors
+
+  @setup
+  Scenario: Testing repository Setup
+      Given I run steps from file "modularity-repo-1.setup"
+       When I enable repository "modularityABDE"
+        And I successfully run "dnf makecache"
+        And I successfully run "dnf module enable ModuleE:f26 -y"
+        And I successfully run "dnf module disable ModuleD --skip-broken -y"
+
+  @bz1688823
+  Scenario: I can install a module in presence of a modular error
+       When I successfully run "dnf install @ModuleB:f26 -y"
+       Then a module ModuleB config file should contain
+          | Key     | Value   |
+          | state   | enabled |
+          | stream  | f26     |
+       And the command stdout should match regexp "Enabling module streams:"
+       And the command stdout should match regexp "ModuleB +f26"
+       And the command stderr should not match regexp "Traceback"