[enh] documents: impl Default for Blockstamp

documents/Cargo.toml

 [package]
 name = "duniter-documents"
-version = "0.7.0"
+version = "0.7.1"
 authors = ["nanocryk <nanocryk@duniter.org>", "elois <elois@ifee.fr>"]
 description = "Handles Duniter documents"
 repository = "https://git.duniter.org/nodes/rust/duniter-rs"

documents/lib.rs

@@ -63,6 +63,13 @@ impl Debug for Hash {
     }
 }
 
+impl Default for Hash {
+    fn default() -> Hash {
+        let default: [u8; 32] = [0; 32];
+        Hash(default)
+    }
+}
+
 impl Hash {
     /// Convert a `Hash` to an hex string.
     pub fn to_hex(&self) -> String {
@@ -168,6 +175,15 @@ impl Debug for Blockstamp {
     }
 }
 
+impl Default for Blockstamp {
+    fn default() -> Blockstamp {
+        Blockstamp {
+            id: BlockId(0),
+            hash: BlockHash(Hash::default()),
+        }
+    }
+}
+
 impl Blockstamp {
     /// Create a `BlockUId` from a text.
     pub fn from_string(src: &str) -> Result<Blockstamp, BlockUIdParseError> {