**Apache Airflow version**: 2.0.1

**Environment**:

- **Cloud provider or hardware configuration**: AWS

**What happened**:
I have Airflow with Cloudwatch-based remote logging running. I also have `BashOperator` that does, for example, `rsync` with invalid parameters, for example `rsync -av test test`. The output of the `rsync` error is formatted and contains empty line. Once that empty line is logged to the Cloudwatch, i receive an error:
```
2021-04-06 19:29:22,318] /home/airflow/.local/lib/python3.6/site-packages/watchtower/__init__.py:154 WatchtowerWarning: Failed to deliver logs: Parameter validation failed:
Invalid length for parameter logEvents[5].message, value: 0, valid range: 1-inf
[2021-04-06 19:29:22,320] /home/airflow/.local/lib/python3.6/site-packages/watchtower/__init__.py:158 WatchtowerWarning: Failed to deliver logs: None
```

So basically empty lines can't be submitted to the Cloudwatch and as result the whole output of the process doesn't appear in logs.

**What you expected to happen**:

I expect to have an output of the bash command in logs. Empty lines can be skipped or replaced with something.

**How to reproduce it**:

For example: run `BashOperator` with `rsync` command that fails on Airflow with Cloudwatch-based remote logging. It could be any other command that produces empty line in the output.
setup.py
"""
    Builds the name of provider package out of the package id provided/
    :param package_id: id of the package (like amazon or microsoft.azure)
    :return: full name of package in PyPI
    """
    package_suffix = package_id.replace(".", "-")
    return f"apache-airflow-providers-{package_suffix}"
def get_excluded_providers() -> List[str]:
    """
    Returns packages excluded for the current python version.
    Currently the only excluded provider is apache hive for Python 3.9.
    Until https://github.com/dropbox/PyHive/issues/380 is fixed.
    """
    return ['apache.hive'] if PY39 else []
def get_all_provider_packages() -> str:
    """Returns all provider packages configured in setup.py"""
    excluded_providers = get_excluded_providers()
    return " ".join(
        get_provider_package_from_package_id(package)
        for package in PROVIDERS_REQUIREMENTS
        if package not in excluded_providers
    )
class AirflowDistribution(Distribution):