Remove unnecessary checks before calls to ast_strlen_zero. Also, change
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-rwxr-xr-x 27419 CHANGES
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drwxr-xr-x - cdr
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drwxr-xr-x - configs
drwxr-xr-x - contrib
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drwxr-xr-x - db1-ast
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drwxr-xr-x - doc
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drwxr-xr-x - editline
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drwxr-xr-x - formats
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drwxr-xr-x - funcs
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drwxr-xr-x - images
drwxr-xr-x - include
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