fix: Handle SplitOverProps JSON errors and cleanup

Wrap processing of entity.SplitOverProps in a try/catch/finally block to stop and handle ConvertFrom-Json errors (-ErrorAction Stop). On failure, emit a warning including the entity's PartitionKey and RowKey so problematic rows can be identified. Always remove the SplitOverProps property in the finally block to ensure cleanup and prevent leftover properties even when parsing fails.

Author: JohnDuprey

Modules/CIPPCore/Public/Get-CIPPAzDatatableEntity.ps1

@@ -81,16 +81,21 @@ function Get-CIPPAzDataTableEntity {
 
     foreach ($entity in $finalResults) {
         if ($entity.SplitOverProps) {
-            $splitInfoList = $entity.SplitOverProps | ConvertFrom-Json
-            foreach ($splitInfo in $splitInfoList) {
-                $mergedData = [string]::Join('', ($splitInfo.SplitHeaders | ForEach-Object { $entity.$_ }))
-                $entity | Add-Member -NotePropertyName $splitInfo.OriginalHeader -NotePropertyValue $mergedData -Force
-                $propsToRemove = $splitInfo.SplitHeaders
-                foreach ($prop in $propsToRemove) {
-                    $entity.PSObject.Properties.Remove($prop)
+            try {
+                $splitInfoList = $entity.SplitOverProps | ConvertFrom-Json -ErrorAction Stop
+                foreach ($splitInfo in $splitInfoList) {
+                    $mergedData = [string]::Join('', ($splitInfo.SplitHeaders | ForEach-Object { $entity.$_ }))
+                    $entity | Add-Member -NotePropertyName $splitInfo.OriginalHeader -NotePropertyValue $mergedData -Force
+                    $propsToRemove = $splitInfo.SplitHeaders
+                    foreach ($prop in $propsToRemove) {
+                        $entity.PSObject.Properties.Remove($prop)
+                    }
                 }
+            } catch {
+                Write-Warning "Failed to process SplitOverProps for entity with PartitionKey='$($entity.PartitionKey)' and RowKey='$($entity.RowKey)': $($_.Exception.Message)"
+            } finally {
+                $entity.PSObject.Properties.Remove('SplitOverProps')
             }
-            $entity.PSObject.Properties.Remove('SplitOverProps')
         }
     }