QuickBase bar chart showing $ over time skips blank months instead of displaying months without $ as 0.

You have to (1) generate the chart using script or (2) modify a QuickBase rendered Chart to plug in the missing data. This timely post (which includes a demo) shows  you the general technique of how to modify a QuickBase rendered chart:

What Chart Enhancements Do You Need?
https://quickbase-community.intuit.com/questions/1447093
it isn't difficult and I was anticipating this question coming up when I made the post. In a nutshell you have to push an extra datapoint onto the x and y axes to represent the category that is missing and give it a zero count. It is a little more complicated than this because for consistency sake you should synthesize the drilldown URLs even though there is no data to drill into. 
Feel free to contact me off-world if you want a solution to this problem as it involves individualized script.

Hi, thanks very much for reviewing my question and providing a helpful response. Your solution looks like something I could figure out eventually (probably with more help) but given time constraints, I'm going to live without it for now. It's good to know that it is possible but would require some custom work. Thanks again.

Leon, the other simpler option would be to enter dummy data with zero sales dollars for every month on your chart.

Yes, thank you! That also works (I checked), although doing that would complicate my project counts, so I'm not going to go that route. I'll survive. I appreciate the ideas!

To encourage you to pursue a script solution to patch up your chart I wrote this Haiku:

QuickBase data
script, that chart,
To the zero in the financial.

http://www.languageisavirus.com/interactive-haiku-generator.html

Hi, I'm having a similar issue, rather than dollars my chart shows count of activities in another table. I have no way to input a zero value for that. Is there another way I can achieve the same outcome?