Deny rule shows exception multiple times

Reproduced in https://github.com/nadavc/repro-rules-exceptions

$ gw build                                                                                                                                                       

Using gradle at '/Users/ncohen/dev/tests/repro/gradlew' to run buildfile '/Users/ncohen/dev/tests/repro/build.gradle':

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'repro'.
> Failed to notify project evaluation listener.
   > Dependency org.slf4j:slf4j-api denied by dependency rule: reproducing bug
   > Dependency org.slf4j:slf4j-api denied by dependency rule: reproducing bug
   > Dependency org.slf4j:slf4j-api denied by dependency rule: reproducing bug
   > Dependency org.slf4j:slf4j-api denied by dependency rule: reproducing bug
   > Dependency org.slf4j:slf4j-api denied by dependency rule: reproducing bug
   > Dependency org.slf4j:slf4j-api denied by dependency rule: reproducing bug
   > Dependency org.slf4j:slf4j-api denied by dependency rule: reproducing bug
   > Dependency org.slf4j:slf4j-api denied by dependency rule: reproducing bug
   > Dependency org.slf4j:slf4j-api denied by dependency rule: reproducing bug

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Start with the reproduction at https://github.com/nadavc/repro-rules-exceptions and run gw build against its build.gradle. Trace the dependency-rule failure reported during project evaluation and identify why the same denial appears repeatedly; done means the exception is shown only once while the build still reports the denied dependency.