sstate: don't silently handle all exceptions in sstate_checkhashes

If checkstatus returns an exception we should silently handle
FetchError, as this means the fetch failed for 'normal' reasons such as
file not found.  However, other exceptions may be raised, and these
should be made visible.

(From OE-Core rev: 50d99faf88a1d82cbd939b9bd6e33ebed2b1ffd8)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/sstate.bbclass

@@ -995,10 +995,11 @@ def sstate_checkhashes(sq_data, d, siginfo=False, currentcount=0, summary=True,
                 foundNet.add(tid)
                 if tid in missed:
                     missed.remove(tid)
-            except:
+            except bb.fetch2.FetchError as e:
                 missed.add(tid)
-                bb.debug(2, "SState: Unsuccessful fetch test for %s" % srcuri)
-                pass
+                bb.debug(2, "SState: Unsuccessful fetch test for %s (%s)" % (srcuri, e))
+            except Exception as e:
+                bb.error("SState: cannot test %s: %s" % (srcuri, e))
             if len(tasklist) >= min_tasks:
                 bb.event.fire(bb.event.ProcessProgress(msg, len(tasklist) - thread_worker.tasks.qsize()), d)