Ignore truncated lines with timestamp_plot

This lets us plot while it's still solving.

Change-Id: I15f9d03a663b6b64873463a87a48548b01f69c4c
Signed-off-by: Austin Schuh <austin.schuh@bluerivertech.com>
diff --git a/aos/events/logging/timestamp_plot.cc b/aos/events/logging/timestamp_plot.cc
index 9c5f2dd..1239eb2 100644
--- a/aos/events/logging/timestamp_plot.cc
+++ b/aos/events/logging/timestamp_plot.cc
@@ -64,7 +64,9 @@
     }
 
     std::vector<std::string_view> l = absl::StrSplit(n, ", ");
-    CHECK_EQ(l.size(), 4u);
+    if (l.size() != 4u) {
+      continue;
+    }
     double t;
     double o;
     CHECK(absl::SimpleAtod(l[0], &t));
@@ -166,7 +168,9 @@
     }
 
     std::vector<std::string_view> l = absl::StrSplit(n, ", ");
-    CHECK_EQ(l.size(), 3u);
+    if (l.size() != 3u) {
+      continue;
+    }
     double t;
     double o;
     CHECK(absl::SimpleAtod(l[0], &t));