da39a3ee5e6b4b0d3255bfef95601890afd80709
Hash algorithms read the input and process it, no matter if there's data at all. This is a valid and wanted behaviour and is even used to verify if a certain implementation is correct. This leads to "null-hashes" for all major algorithms.
To sum it up: da39a3ee5e6b4b0d3255bfef95601890afd80709 is the sha1-hash for an empty file everywhere, the same is true with the null-hashes of other alrogrithms.
https://superuser.com/questions/557925/how-can-zero-byte-files-generate-a-hash-value