better handle missing MaxFileSize prop

Get-BackupCapacityPlanningData.ps1

@@ -43,13 +43,14 @@ ForEach ( $plan in $BackupPlans ) {
     # Function to process each file
     Function ProcessFile {
         param([System.IO.FileInfo]$File)
+
         Switch ( $File ) {
 
             # Filter out if name matches an excluded path
             { $null -ne ($ExcludedPaths | Where-Object { $File.FullName.Replace('\','\\') -match $_.Replace('\','\\') }) } { Update-FilteredFiles $File }
 
             # Filter out if file size is greater than plan maximum
-            { $File.Length -gt $plan.MaxFileSize } { Update-FilteredFiles $File }
+            { $File.Length -gt $MaxFileSize } { Update-FilteredFiles $File }
 
             # Add item to $IncludeFiles
             default { $IncludedFiles.Add($item.FullName, $item.Length) | Out-Null }
@@ -110,6 +111,9 @@ ForEach ( $plan in $BackupPlans ) {
         ForEach ( $path in $IncludedPaths ) { Write-Output $path }
     }
 
+    # Define $MaxFileSize if it exists, or set it to the max value of a long to bypass it
+    If ( $null -ne $plan.MaxFileSize ) { $MaxFileSize = $plan.MaxFileSize } Else { $MaxFileSize = [long]::MaxValue }
+
     # Process each path in $IncludedPaths
     ForEach ($path in $IncludedPaths ) {
 
@@ -117,7 +121,7 @@ ForEach ( $plan in $BackupPlans ) {
         If ( !(Test-Path $path) ) { Continue }
 
         # If $path is an individual file, process it separately
-        $item = Get-Item -Path $path
+        $item = Get-Item -Path $path -ErrorAction SilentlyContinue
         If ( $item -is [System.IO.FileInfo] ) { ProcessFile $item ; Continue }
 
         # Get all children of $path