Fixes JEA error on no modules installed and output

doc/100-General/10-Changelog.md

@@ -32,6 +32,7 @@ Released closed milestones can be found on [GitHub](https://github.com/Icinga/ic
 * [#441](https://github.com/Icinga/icinga-powershell-framework/pull/441) Fixes an exception while loading the Framework, caused by a race condition for missing environment variables which are accessed by some plugins before the Framework is loaded properly
 * [#446](https://github.com/Icinga/icinga-powershell-framework/pull/446) Fixes Icinga for Windows progress preference, which sometimes caused UI glitches
 * [#449](https://github.com/Icinga/icinga-powershell-framework/pull/449) Fixes unhandled exception while importing modules during `Install-IcingaComponent` process, because of possible missing dependencies
+* [#451](https://github.com/Icinga/icinga-powershell-framework/pull/451) Fixes PowerShell being unable to enter JEA context if only the Framework is installed and removes the `|` from plugin output, in case a JEA error is thrown that check commands are not present
 
 ### Enhancements
 

lib/core/jea/Get-IcingaJEAConfiguration.psm1

@@ -154,6 +154,13 @@ function Get-IcingaJEAConfiguration()
         -CmdName 'Add-IcingaForWindowsDaemon' `
         -CmdType 'Function';
 
+    # Fixes error if only the Icinga PowerShell Framework is installed, which then causes JEA to fail entirely because of this missing Cmdlet
+    $UsedCmdlets = Get-IcingaCommandDependency `
+        -DependencyList $DependencyList `
+        -CompiledList $UsedCmdlets `
+        -CmdName 'Select-Object' `
+        -CmdType 'Cmdlet';
+
     # Finally loop through all commands again and build our JEA command list
     $DeserializedFile = Read-IcingaPowerShellModuleFile -FileContent $ModuleContent;
     [array]$JeaCmds   = $DeserializedFile.CommandList + $DeserializedFile.FunctionList;

lib/icinga/plugin/Write-IcingaPluginResult.psm1

@@ -7,10 +7,15 @@ function Write-IcingaPluginResult()
 
     [string]$CheckResult = $PluginOutput;
 
-    if ($PluginPerfData -ne 0) {
-        $CheckResult += "`n`r| ";
+    if ($PluginPerfData.Count -ne 0) {
+        [string]$PerfDataContent = '';
         foreach ($PerfData in $PluginPerfData) {
-            $CheckResult += $PerfData;
+            $PerfDataContent += $PerfData;
+        }
+
+        if ([string]::IsNullOrEmpty($PerfDataContent) -eq $FALSE) {
+            $CheckResult += "`n`r| ";
+            $CheckResult += $PerfDataContent;
         }
     }