Print scale needs a default value

[seansweeney]

I'm pretty sure this is the same as #138, but I can't re-open that one and it doesn't seem like the fix is in place.

At 5.1.0, the default contents of the print scale text box changed from a value to a placeholder. The backing code does not have a default value, so if you click the Create button in 5.1.0 thinking that the placeholder is the default value you get an error:

Our apologies: an error has unexpectedly occurred while starting the viewer.

Please notify the administrator of this website.  Provide a brief description of what you were doing when the problem occurred.  Thank you!

Here's the element definition in 5.1.0:

GPV/WebApp/SharePanel.ascx

Line 83 in 8adbbf6

<input type="text" id="tboPrintScale" name="scale" class="frmInput ratting" placeholder="100" /></span>

And in 5.0.0:

GPV/WebApp/SharePanel.ascx

Line 41 in 0e4f004

<input type="text" id="tboPrintScale" name="scale" value="100" style="width: 60px" /> ft<br/>

You can (at the time of this writing) see the working older version on the Amherst 5.0.0 site:

http://gis.amherstma.gov/public/Viewer.aspx

Here's where the code tries to divide by the scale, which has no default defined:

GPV/WebApp/App_Code/PrintableMapHandler.cs

Line 40 in 0e4f004

originalWidth = extentWidth * 96 / scale;

I thought about submitting this as a pull request but I'm not sure if you want to change the element or the code. For now I've changed the element back to value in my instance.