address test bug w/out of range arccos value; commented out traceback on HessianLSQ fail

Author: briantoby

GSASII/GSASIIlattice.py

@@ -2663,7 +2663,7 @@ def CrsAng(H,cell,SGData):
         DR = np.inner(H3,np.inner(G,H3))
         DHR = np.inner(H,np.inner(G,H3))
     DHR /= np.sqrt(DR*DH)
-    phi = np.where(DHR <= 1.0,acosd(DHR),0.0)
+    phi = acosd(max(-1,min(DHR,1.)))
     if Laue == '-1':
         BA = H.T[1]*a/(b-H.T[0]*cosd(ga))
         BB = H.T[0]*sind(ga)**2

GSASII/GSASIImath.py

@@ -297,6 +297,9 @@ def HessianLSQ(func,x0,Hess,args=(),ftol=1.49012e-8,xtol=1.e-6, maxcyc=0,lamda=-
                 M2 = func(x0+XvecAll,*args)
             except Exception as Msg:
                 if not hasattr(Msg,'msg'): Msg.msg = str(Msg)
+                #import traceback
+                #Msg.msg += '\n'
+                #Msg.msg += traceback.format_exc()
                 G2fil.G2Print(Msg.msg,mode='warn')
                 loops += 1
                 d = np.abs(np.diag(nl.qr(Amatlam)[1]))