Bad error reporting when the command tries to parse a non existing file

Start with the missing-file command in the report and trace compiler.py lines 98, 102, 120, 129, and 313, then inspect utils.py line 212. Reproduce the failure and ensure the original missing-file error is reported without the secondary IndexError or an unprintable Error object.

Vue's loader generated me commands such as:
Error: Command failed: python3 -m transcrypt --nomin --map --verbose --esv 6 "pages.today"

Which ended up in a bad exist (exception within an exception) :

Error compiling /mnt/c/Users/sefir/OneDrive/VisualStudio/projects/nuxt-vue/pages/today.vue?vue&type=script&lang=py&:       17:42:06
Transcrypt (TM) Python to JavaScript Small Sane Subset Transpiler Version 3.7.17
Copyright (C) Geatec Engineering. License: Apache 2.0


Parsing module: /mnt/c/Users/sefir/OneDrive/VisualStudio/projects/transcrypt-binary/transcrypt/modules/org/transcrypt/__runtime__.py
Generating code for module: /mnt/c/Users/sefir/OneDrive/VisualStudio/projects/nuxt-vue/__target__/org.transcrypt.__runtime__.js
Saving source map in: /mnt/c/Users/sefir/OneDrive/VisualStudio/projects/nuxt-vue/__target__/org.transcrypt.__runtime__.map
Saving target code in: /mnt/c/Users/sefir/OneDrive/VisualStudio/projects/nuxt-vue/__target__/org.transcrypt.__runtime__.js
list index out of rangeTraceback (most recent call last):
  File "/mnt/c/Users/sefir/OneDrive/VisualStudio/projects/transcrypt-binary/transcrypt/modules/org/transcrypt/compiler.py", line 98, in __init__    self.provide (self.mainModuleName, '__main__')
  File "/mnt/c/Users/sefir/OneDrive/VisualStudio/projects/transcrypt-binary/transcrypt/modules/org/transcrypt/compiler.py", line 120, in provide
    return Module (self, moduleName, __moduleName__, filter)
  File "/mnt/c/Users/sefir/OneDrive/VisualStudio/projects/transcrypt-binary/transcrypt/modules/org/transcrypt/compiler.py", line 129, in __init__
    self.findPaths (filter)
  File "/mnt/c/Users/sefir/OneDrive/VisualStudio/projects/transcrypt-binary/transcrypt/modules/org/transcrypt/compiler.py", line 313, in findPaths
    raise utils.Error (
org.transcrypt.utils.Error: <unprintable Error object>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/mnt/c/Users/sefir/OneDrive/VisualStudio/projects/transcrypt-binary/transcrypt/__main__.py", line 171, in main
    compiler.Program (transpilationDirs, __symbols__, __envir__)
  File "/mnt/c/Users/sefir/OneDrive/VisualStudio/projects/transcrypt-binary/transcrypt/modules/org/transcrypt/compiler.py", line 102, in __init__
    message = f'\n\t{exception}'
  File "/mnt/c/Users/sefir/OneDrive/VisualStudio/projects/transcrypt-binary/transcrypt/modules/org/transcrypt/utils.py", line 212, in __str__
    result += '\n\tFile \'{}\', line {}, namely:'.format (str (program.importStack [-1][0] .name), self.lineNr)
IndexError: list index out of range


Aborted