Warn empty metadata
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in the load method, if at the end the METADATA key is empty, raise a warning
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updated the load_qasm_file function to return a dictionary with all-caps keys (QASM and METADATA) to match the Ising format
in the load method, if at the end the METADATA key is empty, raise a warning
updated the load_qasm_file function to return a dictionary with all-caps keys (QASM and METADATA) to match the Ising format