Fixed --aggregate option behavior, when all revisions had associated bugs

Author: aik099

CHANGELOG.md

@@ -10,7 +10,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ...
 
 ### Fixed
-...
+- The `--aggregate` option of the `merge` and `commit` commands wasn't working (triggered an exception) when revision without a bug wasn't present in the list of revisions.
 
 ## [0.6.1] - 2022-12-06
 ### Changed

src/SVNBuddy/Repository/RevisionLog/RevisionPrinter.php

@@ -365,6 +365,10 @@ protected function aggregateRevisionsByBug(array $revisions, RevisionLog $revisi
 			}
 		}
 
+		if ( !$bugs_revisions['unknown'] ) {
+			unset($bugs_revisions['unknown']);
+		}
+
 		$bugs_revisions = \array_reverse($bugs_revisions, true);
 
 		$ret = array();