Fix regression causing "nosuchcommand || hello" to short-circuit

Commit 3534c07584 (Adopt the new AST in parse_execution, 2020-07-03)
added to parse_execution_context_t::run_job_conjunction an early
return when any job in a job conjunction fails to launch.  This causes
"nosuchcommand || echo hello" to not execute the continuation.

Fix this by restoring the previous behavior.

Fixes #12654

CHANGELOG.rst

@@ -33,6 +33,7 @@ Regression fixes:
 -----------------
 - Vi mode ``dl`` (:issue:`12461`).
 - (from 4.6) Backspace after newline (:issue:`12583`).
+- (from 3.2) ``nosuchcommand || echo hello`` executes the right hand side again (:issue:`12654`).
 
 fish 4.6.0 (released March 28, 2026)
 ====================================

src/parse_execution.rs

@@ -1749,9 +1749,6 @@ fn run_job_conjunction(
         }
         let mut result = self.run_1_job(ctx, &job_expr.job, associated_block);
         for jc in &job_expr.continuations {
-            if result != EndExecutionReason::Ok {
-                return result;
-            }
             if let Some(reason) = self.check_end_execution(ctx) {
                 return reason;
             }

tests/checks/andandoror.fish

@@ -138,3 +138,10 @@ not --help >/dev/null
 echo $status
 # CHECK: 0
 # CHECK: 0
+
+PATH= cat || echo cat failed
+# CHECKERR: fish: Unknown command: cat
+# CHECKERR: {{.*}}/andandoror.fish (line 142):
+# CHECKERR: PATH= cat || echo cat failed
+# CHECKERR:       ^~^
+# CHECK: cat failed