Make sure Examine dashboard still functions when an index is corrupt

src/Umbraco.Infrastructure/Examine/ExamineIndexRebuilder.cs

@@ -187,8 +187,7 @@ private void RebuildIndexes(bool onlyEmptyIndexes, TimeSpan delay, CancellationT
             {
                 // If an index exists but it has zero docs we'll consider it empty and rebuild
                 IIndex[] indexes = (onlyEmptyIndexes
-                    ? _examineManager.Indexes.Where(x =>
-                        !x.IndexExists() || (x is IIndexStats stats && stats.GetDocumentCount() == 0))
+                    ? _examineManager.Indexes.Where(ShouldRebuild)
                     : _examineManager.Indexes).ToArray();
 
                 if (indexes.Length == 0)
@@ -228,4 +227,17 @@ private void RebuildIndexes(bool onlyEmptyIndexes, TimeSpan delay, CancellationT
             }
         }
     }
+
+    private bool ShouldRebuild(IIndex index)
+    {
+        try
+        {
+            return !index.IndexExists() || (index is IIndexStats stats && stats.GetDocumentCount() == 0);
+        }
+        catch (Exception e)
+        {
+            _logger.LogError(e, "An error occured trying to get determine index shouldRebuild status for index {IndexName}. The index will NOT be considered for rebuilding", index.Name);
+            return false;
+        }
+    }
 }

src/Umbraco.Web.BackOffice/Controllers/ExamineManagementController.cs

@@ -205,7 +205,7 @@ private ExamineIndexModel CreateModel(IIndex index)
             documentCount = indexDiag.GetDocumentCount();
             fieldCount = indexDiag.GetFieldNames().Count();
         }
-        catch (FileNotFoundException ex)
+        catch (Exception ex)
         {
             // Safe catch that will allow to rebuild a corrupted index
             documentCount = 0;