Sceptre is silencing 3rd party exceptions

[1oglop1]

I have had a Jinja error inside my stack_config.yaml and sceptre just printed the message from the exception without notifying it's an error or any other problem so the result looked like correct program exit.

example:

env/stack.yaml

{% set %}
template_path: path/to/template.py

sceptre launch-stack env stack

Actual result:

Expected an expression, got 'end of statement block'

Expected result:
Jinja2 exception trace back which also contains very important information where the error is:

  File "env/stack.yaml", line 1, in template
    {% set  %}

... here the traceback continues ...
#and the last line is
jinja2.exceptions.TemplateSyntaxError: Expected an expression, got 'end of statement block'

It would be nice to either throw entire exception or give user refined information such as: path/stack.yaml, line number, error

Additional info:

I got lucky and caught entire exception during hook development for sceptre v1, but I cannot replicate it for v2 as the concept of environments is gone.
I used this code to run the hook inside interpreter.

if __name__ == '__main__':
    from sceptre.environment import Environment
    # change current directory
    import os

    # os.chdir('..')
    SCEPTRE_DIR = os.path.join(os.getcwd())
    env = Environment(SCEPTRE_DIR, "env")
    # print(env)
    stack = env.stacks["stack"]
    # print(stack)
    hook = EsCognitoOptions(environment_config=stack.environment_config,
                            stack_config=stack.config, connection_manager=stack.connection_manager)
    hook.run() 

[craighurley]

This should be fixed now that #997 was merged. Closing. Re-open if there are still issues after including --debug in your command.