Fix return value

Make Delete return the same errors as before the changes.

Signed-off-by: Adrian Gielniewski <adrian.gielniewski@nordicsemi.no>

Author: adigie

src/credentials/FabricTable.cpp

@@ -1046,12 +1046,17 @@ CHIP_ERROR FabricTable::Delete(FabricIndex fabricIndex)
         }
     }
 
-    // Only return error after trying really hard to remove everything we could
-    ReturnErrorOnFailure(metadataErr);
-    ReturnErrorOnFailure(opKeyErr);
-    ReturnErrorOnFailure(opCertsErr);
+    if (fabricIsInitialized)
+    {
+        // Only return error after trying really hard to remove everything we could
+        ReturnErrorOnFailure(metadataErr);
+        ReturnErrorOnFailure(opKeyErr);
+        ReturnErrorOnFailure(opCertsErr);
 
-    return CHIP_NO_ERROR;
+        return CHIP_NO_ERROR;
+    }
+
+    return CHIP_ERROR_NOT_FOUND;
 }
 
 void FabricTable::DeleteAllFabrics()

src/credentials/FabricTable.h

@@ -417,6 +417,7 @@ class DLL_EXPORT FabricTable
      *
      * @param fabricIndex - Index of fabric for deletion
      * @retval CHIP_NO_ERROR on success
+     * @retval CHIP_ERROR_NOT_FOUND if there is no fabric for that index
      * @retval CHIP_ERROR_INVALID_ARGUMENT if any of the arguments are invalid such as too large or out of bounds
      * @retval other CHIP_ERROR on internal errors
      */