add a catch block

Otherwise the script doesn't work properly if you don't have the
permissions to restart the computer remotely

scripts/computers/restart-computer.ps1

@@ -1,21 +1,30 @@
 function Restart-Domain-Computer
 {
-    $computername = Read-Host 'Please enter a computer name'
-    Restart-Computer -Force -ComputerName $computername
-    sleep 30
-    while ($status -eq $null)
+    try
     {
-        if(Test-Connection -Computername $computername `
-          -BufferSize 16 `
-          -Count 1 `
-          -Quiet){break}
-        Write-Host 'Still offline'
-        sleep 5
+        $computername = Read-Host 'Please enter a computer name'
+        Restart-Computer -Force -ComputerName $computername -ErrorAction Stop
+        sleep 30
+        while ($status -eq $null)
+        {
+            if(Test-Connection -Computername $computername `
+              -BufferSize 16 `
+              -Count 1 `
+              -Quiet){break}
+            Write-Host 'Still offline'
+            sleep 5
+        }
+        Write-Host
+        Write-Host -backgroundcolor "green" $computername ' is online'
+        Write-Host
+        Read-Host 'Press a key to quit'
+    }
+    catch
+    {
+        Write-Warning $_
+        Read-Host 'Press a key to quit'
+        break
     }
-    Write-Host
-    Write-Host -backgroundcolor "green" $computername ' is online'
-    Write-Host
-    Read-Host 'Press a key to quit'
 }
 
 Restart-Domain-Computer