humility ibc black-box should skip empty events

Cargo.toml

@@ -17,7 +17,7 @@ name = "humility"
 #
 # Be sure to check in and push all of the files that change.  Happy versioning!
 #
-version = "0.10.34"
+version = "0.10.35"
 authors = ["Bryan Cantrill <bryan@oxide.computer>"]
 edition = "2018"
 license = "MPL-2.0"

cmd/ibc/src/lib.rs

@@ -228,6 +228,16 @@ impl<'a> IbcHandler<'a> {
     }
 
     fn print_event(&self, e: IbcEvent, verbose: bool, vout_mode: u8) {
+        // In that case that a log contains no entries, the newest event index
+        // reported will be the lowest slot for the log type, which will be
+        // empty. Reading an empty event will return 0xFF in all bytes.
+        if e.timestamp.get() == u32::MAX
+            && e.event_id.get() == u16::MAX
+            && e.status_word.get() == u16::MAX
+        {
+            println!("  EMPTY");
+            return;
+        }
         println!(
             "  TIMESTAMP           {:#010x} = {}",
             e.timestamp.get(),

tests/cmd/chip.trycmd

@@ -13,7 +13,7 @@ For more information try --help
 
 ```
 $ humility --chip this-can-be-anything -V
-humility 0.10.34
+humility 0.10.35
 
 ```
 
@@ -28,7 +28,7 @@ For more information try --help
 
 ```
 $ humility -c apx432 -V
-humility 0.10.34
+humility 0.10.35
 
 ```
 

tests/cmd/version.trycmd

@@ -2,14 +2,14 @@ Long version flag:
 
 ```
 $ humility --version
-humility 0.10.34
+humility 0.10.35
 
 ```
 
 Short version flag:
 
 ```
 $ humility -V
-humility 0.10.34
+humility 0.10.35
 
 ```