<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def lookup_blob(hash_value):
 """ Combines all given arguments to create clean title-tags values. All arguments are divided by a " " seperator and HTML tags are to be removed. """

    try:
        blob = BlobStorage.objects.get(sha256=hash_value)
    except:
        return "Blob not found"
    return blob.content