Corrected to semantic mistakes in phase

proxtoolbox/Problems/Phase/phase.py

@@ -39,7 +39,7 @@ class Phase(Problem):
                 self.config['fresnel_nr'] = 0
                 self.config['use_farfield_formula'] = 1
 
-
+        
 
         #call data processor, read data
 
@@ -59,7 +59,7 @@ class Phase(Problem):
 
         self.config['normM']=self.config['norm_rt_data']; #previously (in matlab) norm_data
         if 'Nz' not in self.config:
-            self.config[Nz] = 1;
+            self.config['Nz'] = 1;
 
 
         #If method_config[formulation is does not exist, i.e. not specified in 
@@ -94,7 +94,7 @@ class Phase(Problem):
             proxoperators[2] ='Approx_PM_Poisson'; # Patrick: This is just to monitor the change of phases!  
 
         if self.config['experiment'] == 'single diffraction':
-            if self.config[distance] == 'far field':
+            if self.config['distance'] == 'far field':
                 if self.config['constraint'] == 'phaselift':
                     proxoperators[1] = 'P_Rank1';
                 elif self.config['constraint'] == 'phaselift2':