Embedding document fails if tokens length > n_ctx

# Prerequisites

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- [X ] I am running the latest code. Development is very rapid so there are no tagged versions as of now.
- [ X] I carefully followed the [README.md](https://github.com/abetlen/llama-cpp-python/blob/main/README.md).
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- [ X] I reviewed the [Discussions](https://github.com/abetlen/llama-cpp-python/discussions), and have a new bug or useful enhancement to share.

# Expected Behavior

Embedding a document, if embedding document tokens are > to n_ctx , it should warn or exit()

# Current Behavior
it fails with error
File "/home/mac/chatest/lib/python3.10/site-packages/langchain/embeddings/llamacpp.py", line 113, in embed_documents
embeddings = [self.client.embed(text) for text in texts]
File "/home/mac/chatest/lib/python3.10/site-packages/langchain/embeddings/llamacpp.py", line 113, in
embeddings = [self.client.embed(text) for text in texts]
File "/home/mac/chatest/lib/python3.10/site-packages/llama_cpp/llama.py", line 905, in embed
return list(map(float, self.create_embedding(input)["data"][0]["embedding"]))
File "/home/mac/chatest/lib/python3.10/site-packages/llama_cpp/llama.py", line 869, in create_embedding
self.eval(tokens)
File "/home/mac/chatest/lib/python3.10/site-packages/llama_cpp/llama.py", line 549, in eval
self.input_ids[self.n_tokens : self.n_tokens + n_tokens] = batch
ValueError: could not broadcast input array from shape (8,) into shape (0,)

# Environment and Context
# Failure Information (for bugs)

Please help provide information about the failure if this is a bug. If it is not a bug, please remove the rest of this template.

# Steps to Reproduce

document = open("DOC/mybigdocument.txt,"r")
text = document.read()
embeddings = LlamaCppEmbeddings(model_path=model_path,verbose=False)
embeddings.embed_documents([text])
# Failure Logs

Pl File "/home/mac/chatest/lib/python3.10/site-packages/langchain/embeddings/llamacpp.py", line 113, in embed_documents
embeddings = [self.client.embed(text) for text in texts]
File "/home/mac/chatest/lib/python3.10/site-packages/langchain/embeddings/llamacpp.py", line 113, in
embeddings = [self.client.embed(text) for text in texts]
File "/home/mac/chatest/lib/python3.10/site-packages/llama_cpp/llama.py", line 905, in embed
return list(map(float, self.create_embedding(input)["data"][0]["embedding"]))
File "/home/mac/chatest/lib/python3.10/site-packages/llama_cpp/llama.py", line 869, in create_embedding
self.eval(tokens)
File "/home/mac/chatest/lib/python3.10/site-packages/llama_cpp/llama.py", line 549, in eval
self.input_ids[self.n_tokens : self.n_tokens + n_tokens] = batch
ValueError: could not broadcast input array from shape (8,) into shape (0,)