Make getcrd give a warning or error if no atoms are specified.

[goddard@…]

The following bug report has been submitted:
Platform:        macOS-12.6-arm64-arm-64bit
ChimeraX Version: 1.5.dev202210102058 (2022-10-10 20:58:47 UTC)
Description
getcrd should probably give an error message if no atoms specified.

I also see getcrd is in the exp_cmd (experimental commands) bundle.  That doesn't seem like the right place for it if we are officially supporting it.  Probably should get migrated to the std_commands bundle.

Ugh.  I see the ribbon command is also in exp_cmds.  Should fix that too and put whereever the cartoon command lives.

Log:
UCSF ChimeraX version: 1.5.dev202210102058 (2022-10-10)  
© 2016-2022 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open 31605 format ccp4 fromDatabase emdb

Opened emdb 31605 as #1, grid size 400,400,400, pixel 0.806, shown at level
0.0113, step 2, values float32  

> ui tool show "Map Eraser"

> getcrd #2

  




OpenGL version: 4.1 Metal - 76.3
OpenGL renderer: Apple M1 Max
OpenGL vendor: Apple

Python: 3.9.11
Locale: en_US.UTF-8
Qt version: PyQt6 6.3.1, Qt 6.3.1
Qt runtime version: 6.3.2
Qt platform: cocoa
Hardware:

    Hardware Overview:

      Model Name: MacBook Pro
      Model Identifier: MacBookPro18,2
      Chip: Apple M1 Max
      Total Number of Cores: 10 (8 performance and 2 efficiency)
      Memory: 32 GB
      System Firmware Version: 7459.141.1
      OS Loader Version: 7459.141.1

Software:

    System Software Overview:

      System Version: macOS 12.6 (21G115)
      Kernel Version: Darwin 21.6.0
      Time since boot: 28 days 2:47

Graphics/Displays:

    Apple M1 Max:

      Chipset Model: Apple M1 Max
      Type: GPU
      Bus: Built-In
      Total Number of Cores: 32
      Vendor: Apple (0x106b)
      Metal Family: Supported, Metal GPUFamily Apple 7
      Displays:
        Color LCD:
          Display Type: Built-in Liquid Retina XDR Display
          Resolution: 3456 x 2234 Retina
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Automatically Adjust Brightness: No
          Connection Type: Internal


Installed Packages:
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    appdirs: 1.4.4
    appnope: 0.1.3
    asttokens: 2.0.8
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    certifi: 2021.10.8
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    ChimeraX-VIPERdb: 1.0
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[pett]

Will open separate ticket for moving "ribbon" from experimental commands.