always show process messages if error and catch geth errors

lib/cmds/blockchain/blockchain.js

@@ -112,13 +112,21 @@ Blockchain.prototype.run = function() {
     });
     if (self.onReadyCallback) {
       // Geth logs appear in stderr somehow
+      let lastMessage;
       child.stderr.on('data', (data) => {
         if (!self.readyCalled && data.indexOf('Mapped network port') > -1) {
           self.readyCalled = true;
-          return self.onReadyCallback();
+          self.onReadyCallback();
         }
+        lastMessage = data;
         console.log('Geth: ' + data);
       });
+      child.on('exit', (code) => {
+        if (code) {
+          console.error('Geth exited with error code ' + 1);
+          console.error(lastMessage);
+        }
+      });
     }
   });
 };

lib/process/processLauncher.js

@@ -36,11 +36,15 @@ class ProcessLauncher {
       }
       self._checkSubscriptions(msg);
     });
+
+    this.process.on('exit', (code) => {
+      self.logger.info('Process exited with code ' + code);
+    });
   }
 
   // Translates logs from the child process to the logger
   _handleLog(msg) {
-    if (this.silent) {
+    if (this.silent && msg.type !== 'error') {
       return;
     }
     if (this.logger[msg.type]) {

lib/processes/blockchainProcessLauncher.js

@@ -20,8 +20,7 @@ class BlockchainProcessLauncher {
       logger: this.logger,
       events: this.events,
       normalizeInput: this.normalizeInput,
-      //silent: true
+      silent: true
-      silent: false
     });
     this.blockchainProcess.send({
       action: constants.blockchain.init, options: {