GloveEmbedder fails when no header row present in embeddings file

[oserikov]

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DeepPavlov version (you can look it up by running pip show deeppavlov): 0.13

Python version: 3.8

Operating system (ubuntu linux, windows, ...): ubuntu 18.04

Issue: embeddings stored in .txt could have no header row w. vocab size and embedding width. in such cases the glove embedder fails to read vectors from file.

Steps to reproduce: try to read e.g. the glove_ru_300_wordpunct file (curl -s -XGET files.deeppavlov.ai/embeddings/glove_300_ru_wiki_lenta_nltk_wordpunct_tokenize/glove_300_ru_wiki_lenta_nltk_wordpunct_tokenize.txt | head -n 3 | cut -d' ' -f-4 to preview)