(GH-1724) search - exit 2 on no results

Preserve 1 and -1 for errors. No results should have something more
deterministic, and 2 would provide that.

Author: ferventcoder

src/chocolatey/infrastructure.app/commands/ChocolateyListCommand.cs

@@ -204,10 +204,10 @@ public virtual void run(ChocolateyConfiguration configuration)
             // note: you must leave the .ToList() here or else the method won't be evaluated!
             var packageResults = _packageService.list_run(configuration).ToList();
 
-            // if there are no results, exit with a 1.
+            // if there are no results, exit with a 2.
             if (configuration.Features.UseEnhancedExitCodes && packageResults.Count == 0 && Environment.ExitCode == 0)
             {
-                Environment.ExitCode = 1;
+                Environment.ExitCode = 2;
             }
         }