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e16bb226c0
The fix may look a bit obscure, so here's what's going on. When we see `from . import helper`, we create an `ImportExpr` with level equal to 1 (corresponding to the number of dots). To resolve such imports, we compute the name of the enclosing package, as part of `ImportExpr.qualifiedTopName()`. For this form of import expression, it is equivalent to `this.getEnclosingModule().getPackageName()`. But `qualifiedTopName` requires that `valid_module_name` holds for its result, and this was _not_ the case for namespace packages. To fix this, we extend `valid_module_name` to include the module names of _any_ folder, not just regular package (which are the ones where there's a `__init__.py` in the folder). Note that this doesn't simply include all folders -- only the ones that result in valid module names in Python.