Merge remote-tracking branch 'remotes/origin/current_hotfix' into new_release

# Conflicts:
#	src_python/pre_proc/create_graphviz_plot.py
#	src_python/pre_proc/graphviz_dot2tex_template.tex
#	src_python/pre_proc/update_tfs_in_fortran_source.py

src_python/pre_proc/create_graphviz_plot.py

@@ -20,6 +20,13 @@ from textwrap import dedent
 from src_python.pre_proc.mpr_interface import OPTIONS
 import re
 
+DOT2TEX_IS_AVAILABLE = True
+try:
+    import dot2tex as d2t
+except ImportError:
+    d2t = None
+    DOT2TEX_IS_AVAILABLE = False
+
 DOT2TEX_IS_AVAILABLE = True
 try:
     import dot2tex as d2t
@@ -32,6 +39,7 @@ OUTPUT_FILE_BASENAME = 'MPR_graphviz'
 DOT2TEX_GUIDE_HTML = 'https://dot2tex.readthedocs.io/en/latest/installation_guide.html'
 DEFAULT_PATH_TO_ROOT = '../../'
 DEFAULT_CONFIG_FILE = 'predefined_nmls/mpr_mhm_visual.nml'
+# DEFAULT_PARAM_FILE = 'mpr_global_parameter.nml' # NOT USED
 DEFAULT_OUTPUT_FORMAT = 'pdf'
 DEFAULT_ENGINE = 'dot'
 # TODO: this is broken?