Dashboard URL display bugs

[JamesNK]

From #8743 (comment)

Bugs:

1. There should be - (dashes) in the grid when there are no values.
   

2. Clicking the details button for an empty text column shows the address. Instead, the details icon shouldn't be display.
   

An example of no correctly displaying no value is Source column with resource like a database which has no source. It has a dash, it has no details icon on mouse over: