Don't print warnings that registry keys can't be found

chocolatey/tools/chocolateyinstall.ps1

@@ -1,4 +1,53 @@
 $ErrorActionPreference = 'Stop'; # stop on all errors
+
+# Copied from https://github.com/chocolatey-community/chocolatey-coreteampackages/blob/a2371345f182da74589897055e3b3703deb0cce3/extensions/chocolatey-core.extension/extensions/Get-UninstallRegistryKey.ps1
+function Get-UninstallRegistryKeySilent {
+    param(
+        [Parameter(Mandatory=$true, ValueFromPipeline=$true)]
+        [ValidateNotNullOrEmpty()]
+        [string] $SoftwareName,
+        [parameter(ValueFromRemainingArguments = $true)]
+        [Object[]] $IgnoredArguments
+    )
+    Write-Debug "Running 'Get-UninstallRegistryKey' for `'$env:ChocolateyPackageName`' with SoftwareName:`'$SoftwareName`'";
+
+    $ErrorActionPreference = 'Stop'
+    $local_key       = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*'
+    $machine_key     = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*'
+    $machine_key6432 = 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*'
+
+    Write-Verbose "Retrieving all uninstall registry keys"
+    [array]$keys = Get-ChildItem -Path @($machine_key6432, $machine_key, $local_key) -ea 0
+    Write-Debug "Registry uninstall keys on system: $($keys.Count)"
+
+    Write-Debug "Error handling check: `'Get-ItemProperty`' fails if a registry key is encoded incorrectly."
+    [int]$maxAttempts = $keys.Count
+    for ([int]$attempt = 1; $attempt -le $maxAttempts; $attempt++)
+    {
+        $success = $false
+
+        $keyPaths = $keys | Select-Object -ExpandProperty PSPath
+        try {
+            [array]$foundKey = Get-ItemProperty -Path $keyPaths -ea 0 | ? { $_.DisplayName -like $SoftwareName }
+            $success = $true
+        } catch {
+            Write-Debug "Found bad key."
+            foreach ($key in $keys){ try{ Get-ItemProperty $key.PsPath > $null } catch { $badKey = $key.PsPath }}
+            Write-Verbose "Skipping bad key: $badKey"
+            [array]$keys = $keys | ? { $badKey -NotContains $_.PsPath }
+        }
+
+        if ($success) { break; }
+        if ($attempt -eq 10) {
+            Write-Warning "Found more than 10 bad registry keys. Run command again with `'--verbose --debug`' for more info."
+            Write-Debug "Each key searched should correspond to an installed program. It is very unlikely to have more than a few programs with incorrectly encoded keys, if any at all. This may be indicative of one or more corrupted registry branches."
+        }
+    }
+
+    Write-Debug "Found $($foundKey.Count) uninstall registry key(s) with SoftwareName:`'$SoftwareName`'";
+    return $foundKey
+}
+
 $toolsDir              = "$(Split-Path -parent $MyInvocation.MyCommand.Definition)"
 $file                  = (Join-Path $toolsDir 'SyncTrayzorSetup-x86.exe')
 $file64                = (Join-Path $toolsDir 'SyncTrayzorSetup-x64.exe')
@@ -16,12 +65,11 @@ $packageArgs = @{
 # x86 to x64 is risky, as it potentially loses their config, Syncthing version, etc.
 # Therefore if they've got the x86 version and not the x64 version, upgrade using the x86 version to
 # avoid breaking them.
-#If only the 32 bit version is installed, upgrade that instead of installing the 64 bit version
-if ((Get-OSArchitectureWidth -compare 64) -and ($env:chocolateyForceX86 -ne $true) -and (Get-UninstallRegistryKey -SoftwareName 'SyncTrayzor (x86)*')) {
-    if (Get-UninstallRegistryKey -SoftwareName 'SyncTrayzor (x64)*') {
-        Write-Host -ForegroundColor green "Both the x86 and x64 versions of SyncTrayzor are installed. Upgrading the x64 version."
+if ((Get-OSArchitectureWidth -compare 64) -and ($env:chocolateyForceX86 -ne $true) -and (Get-UninstallRegistryKeySilent -SoftwareName 'SyncTrayzor (x86)*')) {
+    if (Get-UninstallRegistryKeySilent -SoftwareName 'SyncTrayzor (x64)*') {
+        Write-Host -ForegroundColor green "Both the 32-bit and 64-bit versions of SyncTrayzor are installed. Upgrading the 64-bit version."
     } else {
-        Write-Host -ForegroundColor green "You have the x86 version of SyncTrayzor installed, so upgrading this. If you intended to install the x64 version, please uninstall the x86 version first."
+        Write-Host -ForegroundColor green "You have the 32-bit version of SyncTrayzor installed, so upgrading this. If you intended to install the 64-bit version, please uninstall the 32-bit version first."
         # null out the 64 bit file parameter, so only the 32 bit file is available to install
         $packageArgs['file64'] = $null
     }