bugfixes

src/core.py

@@ -456,7 +456,15 @@ def check(
 
             else:
                 for i in range(n_random_synthetics):
-                    x = problem.random_uniform(xbounds)
+                    while True:
+                        x = problem.random_uniform(xbounds)
+                        try:
+                            x = problem.preconstrain(x)
+                            break
+
+                        except Forbidden:
+                            pass
+
                     sources.append(problem.get_source(x))
                     ms, ns, results = problem.evaluate(x, result_mode='full')
                     results_list.append(results)

src/targets/waveform.py

@@ -218,7 +218,7 @@ class WaveformMisfitTarget(gf.Target, MisfitTarget):
         nmisfits = 1
 
     def string_id(self):
-        return '.'.join(x for x in (self.path) + self.codes if x)
+        return '.'.join(x for x in (self.path,) + self.codes if x)
 
     @property
     def id(self):