process: simplify report uncaught exception logic

This commit combines two if statements into a single if
statement. Another if statement is replaced with a ternary.

PR-URL: #25744
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

Author: cjihrig

lib/internal/process/execution.js

@@ -105,19 +105,14 @@ function createFatalException() {
     if (er == null || er.domain == null) {
       try {
         const report = internalBinding('report');
-        if (report != null) {
-          if (require('internal/options').getOptionValue(
-            '--experimental-report')) {
-            const config = {};
-            report.syncConfig(config, false);
-            if (Array.isArray(config.events) &&
-                config.events.includes('exception')) {
-              if (er) {
-                report.onUnCaughtException(er.stack);
-              } else {
-                report.onUnCaughtException(undefined);
-              }
-            }
+        if (report != null &&
+            require('internal/options')
+              .getOptionValue('--experimental-report')) {
+          const config = {};
+          report.syncConfig(config, false);
+          if (Array.isArray(config.events) &&
+              config.events.includes('exception')) {
+            report.onUnCaughtException(er ? er.stack : undefined);
           }
         }
       } catch {}  // NOOP, node_report unavailable.