Add better handling of catch-reassigned vars

Ref #2052

src/Psalm/Internal/Analyzer/Statements/Block/TryAnalyzer.php

@@ -362,6 +362,8 @@ class TryAnalyzer
                         && $old_unreferenced_vars[$var_id] !== $locations
                     ) {
                         $statements_analyzer->registerVariableUses($locations);
+                    } elseif (isset($newly_unreferenced_vars[$var_id])) {
+                        $context->unreferenced_vars[$var_id] = $newly_unreferenced_vars[$var_id];
                     }
                 }
             }

tests/UnusedVariableTest.php

@@ -1088,6 +1088,20 @@ class UnusedVariableTest extends TestCase
                         $a->bar($i);
                     }',
             ],
+            'noUnusedVariableAfterRedeclaredInCatch' => [
+                '<?php
+                    $path = "";
+
+                    echo $path;
+
+                    try {
+                        // do nothing
+                    } catch (\Exception $exception) {
+                        $path = "hello";
+                    }
+
+                    echo $path;'
+            ],
         ];
     }