Describe the bug

If partition tag set empty string, the message returned should be

  reason: "Invalid partition tag:  Partition tag should not be empty."

Search failed:
status {
  error_code: ILLEGAL_ARGUMENT
  reason: "Invalid partition tag: . Partition tag should not be empty."
}

Steps/Code to reproduce behavior

Expected behavior

**Env

See below; version 2.4.2 from the ubuntugis ppa.

Expected output is just the version information, no crash.

$ gdal2tiles.py --version
GDAL 2.4.2, released 2019/06/28
Traceback (most recent call last):
  File "/usr/bin/gdal2tiles.py", line 2927, in <module>
    main()
  File "/usr/bin/gdal2tiles.py", line 2917, in main
    input_file, output_folder, options = process_args(argv[1:])

Hi everyone,

I am building a sensor fusion framework based on nalgebra, and found out that we do not have support for Lie algebra operations like expmap and logmap. Is is appropriate to add them here or should I implement them in my own crate by using some traits?

Many thanks,

Fan

Synfig version & platform:
Building from source
Debian sid

Issue description:

When I hit the Restore Defaults button, synfig restores everything back to factory settings AND saves it without the user either confirming the changes with OK butt

An option like $ fio cat --bounds w s e n --bounds-crs <crs> --dst-crs <crs> would allow for filtering prior to reprojection, like $ ogr2ogr -spat w s e n -spat_srs <crs>.

See Toblerity/Fiona#210 for a discussion about standardizing bounding boxes as --bounds w s e n rather than --bbox w,s,e,n.

Add Runnable links of the code below the example.
Use link name Run Code which links to a Online C++ complier conatining the example code.
Use Rextester as the Online C++ Compiler (If you have a better suggesstion please comment).

Follow below steps to generate the Run Code Link.

1. Go to Rextester
2. Copy or write the example