Graphs with multiple data sources can no longer display percenticles

[KrisShannon]

Describe the bug

The fix for #3340 (621091f) added an early return when encountering a NaN data source.

This has stopped percentiles working on graphs with multiple data sources.

To Reproduce

Steps to reproduce the behavior:

1. Create two data sources, one with data and the other with NaN's
2. Create a graph using aggregate_current percentiles (e.g.|95:bits:0:aggregate_current:2|) across the two data sources.
3. View the graph
4. Percentiles are shown as 0

Expected behavior

Percentile calculation should ignore the NaN data source(s) and be based on any remaining sources with data.

Additional context

I've locally removed the early return from nth_percentile_fetch_statistics and the graphs appear to be working correctly:

--- lib/graph_variables.php
+++ lib/graph_variables.php
@@ -182,8 +182,6 @@ function nth_percentile_fetch_statistics($percentile, &$local_data_ids, &$fetch_array, $cf) {
 							$asum_array[$ds_name][$timestamp]  = $data;
 						}
 					}
-				} else {
-					return false;
 				}
 			}
 		}

[TheWitness]

Thanks for your contribution on this.

[DFlexy]

Guys sorry for reply here more i try fix and dont work need help

[TheWitness]

Sorry, was on sabbatical.

[github-actions]

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