nemo text normalizer fails to normalize in german - _pywrapfst.FstOpError: Operation failed
**Describe the bug**

Nemo normalizer fails to normalize phrases in german. Operation fails with a _pywrapfst.FstOpError caused by line 464 in the extensions/_pynini.pyx file.

**Steps/Code to reproduce bug**

`from nemo_text_processing.text_normalization.normalize import Normalizer
normalized_text = Normalizer(input_case='cased', lang='de').normalize('0.12', verbose=True)
`

**Expected behavior**

`normalized_text = 'null komma eins zwei'`

**Environment overview**

 - Environment location: Bare-metal: Ubuntu 20.04.3 LTS
 
 - Method of NeMo install: 
`git clone -q https://github.com/NVIDIA/NeMo.git`
`pip install -e NeMo`

**Environment details**

- OS version: Ubuntu 20.04.3 LTS
- PyTorch version:  Torch 1.10.0
- Python version: Python 3.8.12
