Blinking Question (?) and HDD missing in Disk Utility after failed upgrade to OS Mojave

Try the following:

Internet/Network Recovery of El Capitan or Later on a Clean Disk

     If possible, back up your files before proceeding.

1. Restart the computer. Immediately, at or before the chime, hold down the (Command-Option-R) keys until a globe appears.
2. The Utility Menu will appear in from 5-20 minutes. Be patient.
3. Select Disk Utility and click on the Continue button.
4. When Disk Utility loads select the target drive (out-dented entry w/type and size) from the side list.
5. Click on the Erase button in Disk Utility's toolbar. A panel will drop down.
6. Set the partition scheme to GUID.
7. Set the Format type to APFS (SSDs, only if installing Mojave or Catalina ) or Mac OS Extended, (Journaled.)
8. Click on the Apply button, then click on the Done button when it activates.
9. Quit Disk Utility and return to the Utility Menu.
10. Select Install OS X and click on the Continue button.

Your disk drive is toast. You need to replace it if it's replaceable which is unlikely. But you can check OWC to see if there is a replaceable SSD for your model. If there is none, then you will need to have it replaced by Apple. Make an appointment at the Apple Genius Bar for service after the stores re-open. If you need to find an Apple Store - Find a Store - Apple. Also, see How to find your nearest Apple Authorized Service Provider (AASP) or Distributor (AAD).

When you opened Disk Utility were you booted from the Recovery HD? Your interrupted installation probably occurred because the SSD failed. The only reason that the drive does not appear in Disk Utility when using Network Recovery is that the drive has failed. I am basing this on what you have reported. I do not have hands-on your computer, so I must with what you have written. It would help, perhaps, if you went through the recovery process once more until you get to the point which you reported. Take a snapshot of what you see. Please be sure it is clear before you post it. I only need to see the Disk Utility window you saw.

I cannot clearly see the smaller pictures. The larger one is quite clear. Definitely, confirms there is no existing disk. What is shown is the remaining info for the disk image that contained the installer. It is not a physical disk.