fix .key size 0 crash

build.gradle

@@ -4,7 +4,7 @@ plugins {
 }
 
 group 'io.zhile.research.intellij'
-version '2.1.13'
+version '2.1.14'
 
 sourceCompatibility = 1.7
 targetCompatibility = 1.7

src/main/java/io/zhile/research/intellij/ier/common/LicenseFileRecord.java

@@ -13,7 +13,10 @@ public class LicenseFileRecord implements EvalRecord {
 
     public LicenseFileRecord(File file) {
         this.file = file;
-
+        if (file.length() == 0) {
+            expireDate = new Date(~System.currentTimeMillis());
+            return;
+        }
         try (DataInputStream dis = new DataInputStream(new FileInputStream(file))) {
             expireDate = new Date(~dis.readLong() + 2592000000L);
         } catch (Exception e) {