OpenGrok displays only one result on error condition

[bond-]

Reproducible steps:

1. Create an index and move the source from the location. (Ideally I should re-index)
2. Search for some text in that file and you will see an error on that page and only one result displays
   In another case, initial results got displayed until this error.
   For ex: There are 25 results and until 4 results there is no issue. 5th result had an error and results from here onwards are not displayed.

Expected:

1. All results to be displayed
2. The error message to not include stacktrace and the search box within the results

PFA screenshot

[vladak]

There is definitely a bug raised for the embedded search box, cannot find it right now.

[vladak]

Also similar to #517