FileNotFound loading fine tuned stt_en_citrinet_512 model
**Describe the bug**

If I attempt to fine tune stt_en_citrinet_512, the training runs as expected but when I subsequently try to load a checkpoint I get the following error

FileNotFoundError: src path does not exist or it is not a path in nemo file. src value I got was: /home/smajumdar/PycharmProjects/nemo-eval/nemo_beta_eval/asrset/manifests/asrset_1.4/tokenizers/no_appen/tokenizer_spe_unigram_v1024/tokenizer.model. Absolute: /home/smajumdar/PycharmProjects/nemo-eval/nemo_beta_eval/asrset/manifests/asrset_1.4/tokenizers/no_appen/tokenizer_spe_unigram_v1024/tokenizer.model

I can see that the path is the tokenizer path from the original stt_en_citrinet_512 model, however, I don't understand why it's trying to load the file when I load the checkpoint.

**Expected behavior**

The checkpoint file should load without throwing a FileNotFound error

**Environment overview (please complete the following information)**

AWS Sagemaker
ml.g4dn.xlarge
%pip install nemo_toolkit['all']==1.2.0

Otherwise, please provide:
- OS version: Debian GNU/Linux 10 (buster)
- PyTorch version : 1.9.0+cu102
- Python version : 3 .6.13

**Additional context**

Add any other context about the problem here.
Example: GPU model
