Make StateMachineCaller thread will not exit when throw exception (#155)

Author: RongtongJin

src/main/java/io/openmessaging/storage/dledger/statemachine/StateMachineCaller.java

@@ -136,6 +136,8 @@ public void run() {
                 }
             } catch (final InterruptedException e) {
                 logger.error("Error happen in {} when pull task from task queue", getServiceName(), e);
+            } catch (Throwable e) {
+                logger.error("Apply task exception", e);
             }
         }
     }