SQL: read: Minor change.

Model/read_table_for_open.py

@@ -551,7 +551,11 @@ class ReadTableForOpen:
           FROM SedimentsFile
         '''
 
-        data = self.execute(query)[0]
+        res = self.execute(query)
+        if len(res) == 0:
+            return
+
+        data = res[0]
 
         stg.path_fine = data[0]
         stg.filename_fine = data[1]
@@ -594,6 +598,9 @@ class ReadTableForOpen:
         stg.frac_vol_sand = []
         stg.frac_vol_sand_cumul = []
 
+        if len(data) == 0:
+            return
+
         for d in data:
             stg.sample_fine.append((d[0], d[1]))
             stg.distance_from_bank_fine.append(d[2])
@@ -642,6 +649,9 @@ class ReadTableForOpen:
         '''
 
         data = self.execute(query)
+        if len(data) == 0:
+            return
+
         it = iter(data[0])
 
         stg.calib_acoustic_data = next(it)
@@ -708,6 +718,9 @@ class ReadTableForOpen:
         '''
 
         data = self.execute(query)
+        if len(data) == 0:
+            return
+
         it = iter(data[0])
 
         stg.path_calibration_file = next(it)