It's weird that the log file doesn't mention anything. This might happen when everything gets parsed correctly, but the Steam manifests simply don't contain anything.
Can you open the Steam directory and verify that the "libraryfolders.vdf" file exists and contains paths to your libraries? The file will look something like this:
1 │ "libraryfolders"
2 │ {
3 │ "0"
4 │ {
5 │ "path" "/ssd-pool/games/SteamLibrary"
6 │ "label" ""
7 │ "contentid" "4129378406094616110"
8 │ "totalsize" "0"
9 │ "update_clean_bytes_tally" "7022581164"
10 │ "time_last_update_corruption" "0"
11 │ "apps"
12 │ {
13 │ "228980" "476185459"
20 │ }
21 │ }
22 │ }