Check head.state file existence before validating its integrity

This prevents unnecessary NoSuchFileExceptions from being logged at
startup.

refs #7124

Change-Id: I500c937ec8894f6c97dcfe73b01efc4adc9b59a6
(cherry picked from commit b4e846e4206e688050b659f2d66581d26e3dc1ce)

diff --git a/bundles/org.simantics.acorn/src/org/simantics/acorn/HeadState.java b/bundles/org.simantics.acorn/src/org/simantics/acorn/HeadState.java
index ea54a418578c13dd335e6054ae547e51c4424092..106134264c606cc1d3ded07199ec5b1688569e7a 100644 (file)
--- a/bundles/org.simantics.acorn/src/org/simantics/acorn/HeadState.java
+++ b/bundles/org.simantics.acorn/src/org/simantics/acorn/HeadState.java
@@ -99,6 +99,8 @@ public class HeadState {
     }
 
     public static boolean validateHeadStateIntegrity(Path headState) {
+        if (!Files.exists(headState))
+            return false;
         try {
             byte[] bytes = Files.readAllBytes(headState);
             MessageDigest sha1 = MessageDigest.getInstance(SHA_1);